Probiotics for Dogs with Skin Conditions: Itching, Allergies and Infections

Summary

Probiotics offer a clinically supported, natural way to manage a range of canine skin conditions, from itchy skin and allergic flare-ups to the recurring bacterial infections that often follow. These problems frequently begin not on the skin but in the gut, through the connection between gut health and skin health known as the gut-skin axis, now well established in veterinary science.

Recent randomised controlled trials show that probiotic and postbiotic supplementation can reduce itching faster than placebo and shift both the gut and the skin microbiome in a healthier direction, including a measurable fall in the bacteria most often behind canine skin infections.¹,¹² This guide explains how probiotics work across the gut-skin axis, which strains the current research supports, how they fit alongside conventional treatment, and how to choose and use them for your itchy dog.

At a Glance

Many canine skin problems, from itching and allergy to recurring infection, begin in the gut, which is why probiotics that rebalance the microbiome can ease the skin from the inside.

Key Facts

• The gut-skin axis links gut health to skin health, with around 70 to 80% of immune function residing in the gut.
• A 2024 randomised controlled trial found probiotics reduced itching faster than placebo, with many dogs reaching normal pruritus levels by week 4.
• A 2026 University of Adelaide study showed oral supplementation reshaped the skin microbiome and reduced Staphylococcus pseudintermedius, the main skin-infection bacterium.
• The strains with the strongest evidence include L. rhamnosus, L. helveticus, S. boulardii and spore-forming Bacillus.
• Probiotics complement rather than replace conventional treatment, and active infections still need veterinary care.
• Expect initial improvement within 2 to 4 weeks, with significant results by 4 to 6 weeks.

---

Key Insight

Treating the skin alone treats the symptom. Rebalancing the gut treats one of its most common causes, which is why probiotics work where topical fixes stall.

Introduction

Skin problems are one of the most common reasons dogs are taken to the vet, and they are rarely as simple as they look. Persistent scratching, allergic flare-ups, recurring ear trouble and repeated skin infections often share a single underlying driver: an imbalanced gut microbiome influencing immune regulation and inflammation throughout the body. Addressing that root cause, rather than only suppressing the symptom, is what makes probiotics a meaningful part of skin management. This guide brings together the science of the gut-skin axis, the strains with the strongest evidence, and a practical plan you can follow.

Key Takeaways

• Probiotics help across the range of skin conditions, not just itch. Clinical trials show faster improvement in pruritic dermatitis, and 2026 research shows oral supplementation can also reduce the bacteria behind canine skin infections.
• The gut-skin axis is scientifically established. Around 70 to 80% of immune function resides in the gut, directly influencing skin health, including probiotics for skin conditions.
• Specific strains matter most. Lactobacillus rhamnosus, Lactobacillus helveticus, Saccharomyces boulardii and spore-forming Bacillus strains have the strongest research support.
• Timelines are realistic. Initial improvement typically occurs within 2 to 4 weeks, with significant results by 4 to 6 weeks.
• Underlying causes must be addressed alongside supplementation, including allergies, nutritional gaps and dysbiosis.
• Some cases need veterinary care. Severe or worsening symptoms need professional evaluation and may require conventional treatment alongside probiotics.

In This Guide

• Do Probiotics Help Dogs with Skin Conditions?
• Understanding Itchy Skin and Skin Conditions in Dogs
• Canine Atopic Dermatitis: The Primary Cause of Chronic Itching
• The Gut-Skin Axis: Why Gut Health Affects Your Dog’s Skin
• How Probiotics Help with Itching and Inflammation
• Probiotics and Bacterial Skin Infections in Dogs
• Best Probiotic Strains for Dogs with Skin Conditions
• How to Choose the Right Probiotic for Your Dog
• Conventional Treatments: How Probiotics Compare
• Complementary Nutritional and Natural Strategies
• When to See Your Veterinarian
• How Bonza Supports Skin Health
• Frequently Asked Questions
• Conclusion
• References
• Editorial Information

Do Probiotics Help Dogs with Skin Conditions?

Yes. Clinical research supports probiotics for canine skin conditions, working through the gut-skin axis rather than on the skin directly. A 2024 randomised controlled trial found that dogs receiving probiotic supplementation improved faster than placebo, many reaching normal pruritus levels by week 4 compared with week 7 for placebo.¹ A 2026 University of Adelaide study went further, showing that daily oral probiotic and postbiotic supplementation also reshaped the skin microbiome and reduced Staphylococcus pseudintermedius, the main cause of canine skin infection.¹²

In short, probiotics can ease itching, calm allergic skin, support the skin barrier, and help guard against the secondary infections that so often complicate skin disease. The most effective strains include Lactobacillus rhamnosus, Lactobacillus helveticus, Saccharomyces boulardii, Bacillus coagulans and Bacillus velezensis, at 1 to 10 billion CFU depending on dog size, with initial improvement usually seen within 2 to 4 weeks.

Understanding Itchy Skin and Skin Conditions in Dogs

Most canine skin conditions present first as itch, but the underlying causes are varied and often overlap. Understanding the root cause, rather than only suppressing the scratching, is the key to lasting management.

What Is Pruritus?

Pruritus is the medical term for itchy skin, an unpleasant sensation that provokes scratching, licking, chewing or rubbing. It is not a disease in itself but a symptom of an underlying condition, and it is one of the most common clinical signs in veterinary dermatology. The International Committee for Allergic Diseases in Animals (ICADA) recognises that pruritus severity ranges from mild occasional scratching to severe, uncontrollable itching that significantly affects quality of life.²

Causes of Itchy Skin

Itchy skin in dogs can result from several underlying conditions, often more than one at once:

• Allergies. Environmental allergens (pollen, dust mites, mould), food allergies, or contact irritants can trigger inflammatory responses. Allergic skin disease, particularly canine atopic dermatitis, is the most common cause of chronic pruritus.
• Imbalanced gut microbiota (dysbiosis). A disrupted microbiome can drive systemic inflammation that surfaces as skin symptoms. Dogs with allergic skin conditions often have altered gut bacterial populations compared with healthy dogs.
• Fungal or bacterial infections. Secondary infections, often developing as a consequence of allergies and scratching, can significantly worsen itching. Yeast (Malassezia) and bacterial (Staphylococcus) overgrowth are common culprits.
• Nutritional deficiencies. Shortfalls in essential fatty acids, zinc or vitamins can compromise the skin barrier and lead to dry, itchy skin.
• Parasites. Fleas, mites, lice and other external parasites can directly irritate the skin. Flea allergy dermatitis is particularly common and can cause intense itching from just a few bites.

Symptoms of Pruritus

Signs that a dog is dealing with significant itch include persistent scratching, licking or chewing; red, inflamed skin; hair loss from self-trauma; scabs, crusts or open sores; thickened, darkened, elephant-like skin (lichenification); hot spots; recurrent ear infections with head shaking; a foul odour from skin or ears; reddish-brown staining on paws; and restlessness or disturbed sleep.

Which Dog Breeds Are More Prone to Skin Conditions?

Certain breeds carry genetic predispositions to allergic skin disease, including West Highland White Terriers, Dalmatians, Golden Retrievers, Labrador Retrievers, Boxers, Bull Terriers, English Bulldogs, French Bulldogs, Pugs, German Shepherds, Shar-Peis, Irish Setters and Cocker Spaniels. Research in PLOS One specifically investigated the gut microbiome of West Highland White Terriers, a breed with high rates of atopic dermatitis, underlining the value of understanding breed-specific factors.³ For these breeds, probiotic supplementation and dietary management can be particularly valuable preventively.

Canine Atopic Dermatitis: The Primary Cause of Chronic Itching

Canine atopic dermatitis is the leading cause of chronic, relapsing itch in dogs, and it is the condition most clearly linked to both gut and skin microbiome imbalance.

What Is Canine Atopic Dermatitis (CAD)?

Canine atopic dermatitis is a genetically predisposed, chronic inflammatory skin disease associated with environmental allergens. It is the second most common allergic skin condition in dogs after flea allergy dermatitis, affecting an estimated 10 to 15% of the canine population. It typically develops between 6 months and 3 years of age and tends to be lifelong, with symptoms often worsening over time without proper management. Diagnosis involves ruling out similar conditions, interpreting clinical history and features, and potentially allergy testing.²

How CAD Affects the Skin Barrier

In healthy dogs the skin barrier keeps moisture in and allergens, pathogens and irritants out. Atopic dogs have inherent defects in this barrier. Structural lipid abnormalities lead to increased water loss and easier allergen penetration. Immune dysregulation causes the immune system to overreact to harmless substances, triggering inflammation. And a compromised barrier allows opportunistic Staphylococcus bacteria and Malassezia yeast to colonise and worsen inflammation, creating a self-perpetuating cycle of itching and infection.

The Role of the Skin Microbiome

Just as the gut has a microbiome, so does the skin, and its balance matters. A landmark study by Rodrigues Hoffmann and colleagues found that allergic dogs have lower species richness in their skin microbiome than healthy dogs.⁴ This reduced diversity can compromise the skin’s natural defences. The skin and gut microbiomes are connected through immune signalling and inflammatory pathways, which is why oral probiotics can influence skin health even though they are not applied to the skin.

The Gut-Skin Axis: Why Gut Health Affects Your Dog’s Skin

The gut-skin axis is the bidirectional communication between the gastrointestinal tract and the skin, operating through the immune system, inflammatory pathways and microbial metabolites. It is the reason oral probiotics help skin-based conditions.

The Science Behind the Connection

Gut health directly influences skin condition. Dogs with atopic dermatitis consistently show differences in gut microbiome composition compared with healthy dogs, and interventions that improve gut health often improve skin symptoms.

Immune System Location

The single most important fact about the gut-skin axis is that roughly 70 to 80% of a dog’s immune cells reside in the gut-associated lymphoid tissue (GALT). The gut is therefore the command centre for immune function throughout the body, and the microbiome helps train the immune system to tell harmless substances from genuine threats. When the microbiome is balanced, immune responses are calibrated and inflammation is controlled. When it is disrupted (dysbiosis), the immune system can become overactive, systemic inflammation rises, and skin barrier function is compromised.

Intestinal Permeability and Skin Symptoms

A healthy gut lining is a selective barrier maintained by tight junctions. When these are compromised, a state sometimes called leaky gut, inflammatory molecules and bacterial products such as lipopolysaccharides can enter the bloodstream, food particles can trigger immune reactions, and the resulting systemic inflammation creates conditions favourable for skin problems: more itching, reduced barrier function, and greater susceptibility to secondary infection.

Research Evidence: The 2024 Clinical Trial

The gut-skin connection is no longer theoretical. A 2024 double-blind randomised controlled trial in Animals evaluated a probiotic and nutraceutical blend in privately owned dogs with pruritic dermatitis. Dogs in the probiotic group showed greater improvement in owner-assessed signs at week 2, and more reached normal pruritus levels by week 4 compared with week 7 for placebo.¹ The probiotic group also showed enrichment of beneficial bacteria and a reduction in species linked to negative health effects, while the placebo group shifted the other way.

New Evidence: The 2026 Skin Microbiome Study

The most recent evidence extends the axis from the gut to the skin itself. A 2026 University of Adelaide study tracked 12 dogs over 90 days of daily oral probiotic and postbiotic supplementation, using full-length 16S rRNA gene sequencing. Supplementation increased beneficial species (including Lactobacillus acidophilus, Lactobacillus johnsonii and Limosilactobacillus reuteri) in both gut and skin samples, raised microbial diversity, and reduced Staphylococcus pseudintermedius, the bacterium most commonly behind canine skin infection.¹² This is direct evidence that an oral supplement can shift the skin’s own microbial balance and support its defences against infection.

How Probiotics Help with Itching and Inflammation

Probiotics ease skin symptoms through several complementary mechanisms working along the gut-skin axis.

Modulating the Immune System

Probiotics regulate immune responses and reduce hypersensitivity to allergens. Research has shown that probiotic supplementation in dogs can enhance beneficial immune markers (serum IgG, IFN-alpha, faecal IgA) while reducing TNF-alpha, indicating improved immune function with less inflammatory signalling.⁵ By promoting a balanced gut microbiome, probiotics help prevent the overactive reactions that drive allergic itching.

Since most immune tissue sits in the gut, this immune modulation is the gut-immune axis at work.

Reducing Inflammation

Certain strains produce anti-inflammatory compounds that calm irritated skin. Beneficial bacteria ferment dietary fibre into short-chain fatty acids such as butyrate, which have potent anti-inflammatory effects and help maintain gut barrier integrity. Some probiotics produce antimicrobial peptides that inhibit pathogenic bacteria and yeast, and others influence regulatory cytokines that calm rather than amplify inflammation.

Strengthening the Gut-Skin Axis

Probiotics improve gut health in ways that benefit skin: reducing intestinal permeability by strengthening tight junctions, decreasing systemic inflammation, supporting absorption of the nutrients skin needs, and competing with pathogens to reduce harmful populations.

Supporting Skin Barrier Function

By lowering systemic inflammation and supporting immune balance, probiotics indirectly help maintain a healthy skin barrier, one that retains moisture, resists allergens and irritants, is less prone to secondary infection, and recovers faster from damage.

Timeline of Expected Improvements

Based on clinical research, expect probiotics to colonise the gut in weeks 1 to 2, sometimes with mild temporary digestive changes and early signs of reduced itching. Significant differences from placebo emerge around week 2¹, with reduced scratching and inflammation through weeks 2 to 4. Many dogs reach normal pruritus levels by week 4 to 6, with visible coat improvement and fewer flare-ups, and cumulative benefits continuing beyond week 6 with consistent use. For more, read Probiotics for Dogs with Allergies: A Primary Nutritional Intervention.

Probiotics and Bacterial Skin Infections in Dogs

Probiotics may help guard against the bacterial skin infections that so often complicate allergic and itchy skin, not by replacing antibiotics, but by supporting a skin and gut microbiome that is more resistant to overgrowth of harmful species.

Why Skin Infections Recur

Most canine bacterial skin infection (pyoderma) is caused by Staphylococcus pseudintermedius, a normal skin resident that turns opportunistic when the barrier is compromised by allergy, scratching or a damaged microbiome. Because the underlying cause persists, infections tend to recur, and repeated antibiotic courses raise the risk of antimicrobial resistance. This is why supporting the skin’s own defences matters.

What the 2026 Evidence Shows

The 2026 Adelaide study is the first to show that oral daily probiotic and postbiotic supplementation can shift the canine skin microbiome itself. Over 90 days, supplemented dogs showed a reduction in Staphylococcus pseudintermedius and an increase in beneficial, diversity-promoting species across both gut and skin.¹² The researchers framed this explicitly as an opportunity to support skin health while reducing reliance on antibiotics, an antimicrobial-stewardship benefit as well as a comfort one.

What This Means in Practice

The evidence is early and was conducted in healthy dogs, so probiotics should be seen as preventive support for skin resilience rather than a treatment for active infection, which still needs veterinary diagnosis and, where required, antibiotics. Used consistently, however, a quality probiotic and postbiotic supplement may help reduce the conditions in which infection takes hold, and complements veterinary care during and after treatment.

Best Probiotic Strains for Dogs with Skin Conditions

Not all probiotics are equally effective for skin. The strains below have the strongest research support for managing itch, allergy and infection risk.

Lactobacillus rhamnosus

One of the most studied strains for immune modulation and skin health. It improves skin barrier function, modulates immune responses to allergens to reduce hypersensitivity, and reduces inflammatory cytokines associated with allergic responses. It is particularly valuable for atopic dermatitis.

Lactobacillus acidophilus

A foundational strain that promotes a healthy balance of gut bacteria, produces lactic acid that creates an environment hostile to pathogens, can reduce the likelihood of allergic responses in dogs⁶, and helps alleviate symptoms of food allergy and dermatitis.

Lactobacillus helveticus

A strain specifically researched for skin benefits. Studies in atopic dermatitis models show it reduces inflammatory markers including TNF-alpha and IL-4⁸, helps restore the skin’s natural healthy microbiota⁹, and inhibits the epidermal changes associated with chronic skin inflammation, supporting immune modulation through the gut-skin axis.

Bifidobacterium bifidum

Essential for gut barrier function and immune support. It strengthens the gut lining, may help prevent certain allergies through immune modulation⁶, reduces inflammation and skin-related symptoms, and produces short-chain fatty acids that nourish the gut lining.

Saccharomyces boulardii

A beneficial yeast with distinct advantages. It cannot be killed by antibiotics, making it ideal during or after antibiotic treatment, combats harmful pathogens, supports gut integrity, and is particularly useful for dogs with both skin and digestive issues.

Bacillus coagulans (Heyndrickxia coagulans)

A spore-forming probiotic that survives stomach acid, heat and antibiotics thanks to a protective spore coat, colonises the gut effectively, and produces anti-inflammatory metabolites that help alleviate itchy skin.

Bacillus subtilis / Bacillus velezensis

Soil-based, spore-forming strains with strong anti-inflammatory and antimicrobial properties. A 2024 study found that Bacillus subtilis and Bacillus coagulans spores can reduce clinical symptoms and shorten wound repair in dogs with allergic contact dermatitis.¹⁰ They are highly resistant to stomach acid and bile, and Calsporin® (Bacillus velezensis DSM 15544, previously classified as Bacillus subtilis C-3102) is a clinically researched form used in veterinary applications.

Strain Comparison Table

A framing note: the table summarises the primary skin benefit, acid survival and evidence level for each strain discussed above.

Strain	Key Benefit for Skin	Survives Stomach Acid	Evidence Level
L. rhamnosus	Immune modulation, reduces hypersensitivity	Moderate	Strong
L. acidophilus	Reduces allergic responses	Moderate	Strong
L. helveticus	Reduces TNF-alpha and IL-4, restores skin microbiome	Moderate	Strong
B. bifidum	Gut barrier support, prevents systemic inflammation	Moderate	Strong
S. boulardii	Survives antibiotics, reduces pathogens	Excellent	Strong
B. coagulans	Anti-inflammatory metabolites, wound repair	Excellent	Strong
B. subtilis/velezensis	Antimicrobial, gut barrier integrity	Excellent	Strong

How to Choose the Right Probiotic for Your Dog

The right probiotic for skin combines the proven strains above with quality markers that guarantee the bacteria actually reach and act in the gut.

CFU Count (Colony Forming Units)

CFU measures viable bacteria. For skin conditions, look for 1 to 5 billion CFU for small dogs under 10kg, 5 to 10 billion for medium dogs 10 to 25kg, and 10 to 20 billion for large dogs over 25kg. The count should be guaranteed through the expiration date, not just at manufacture.

Strain Selection for Skin Conditions

Prioritise products containing at least one Lactobacillus strain (ideally L. rhamnosus or L. helveticus), a spore-forming strain for guaranteed survival, and multiple strains for complementary mechanisms. Multi-strain formulations often outperform single-strain products.

Viability and Survivability

Many probiotics die before reaching the intestines. Look for spore-forming strains that naturally resist stomach acid, clear storage requirements, third-party testing of CFU counts, and expiration-date viability guarantees.

Prebiotic and Postbiotic Inclusion

The most advanced formulations are synbiotics, combining prebiotics such as FOS, MOS or inulin with postbiotics. Research on Saccharomyces cerevisiae fermentation product (SCFP) postbiotics such as TruPet™ shows benefits for skin and coat health, including increased skin sebum and lower inflammatory markers¹¹, and a 2025 study found an indole-rich postbiotic reduced scratching by 20% and owner-perceived itching by 27%.⁷ Products combining pre-, pro- and postbiotics often deliver the best results.

What to Avoid

Avoid unnecessary fillers and binders, added sugars (which can feed yeast and worsen skin issues), artificial colours or flavours, common allergens, vague proprietary-blend labelling, and products near expiry.

Quality Markers

Reputable products clearly identify strains (species and strain designation), guarantee CFU through expiration, use transparent ingredient lists, hold manufacturing-quality certifications, and carry veterinary backing or formulation.

Conventional Treatments: How Probiotics Compare

Conventional treatments suppress symptoms quickly, while probiotics address the underlying gut-skin dysfunction. Understanding both helps you use them together effectively.

Apoquel (Oclacitinib)

A Janus kinase inhibitor that blocks the itch-signal pathway, providing rapid relief, often within 4 hours. It is very effective for symptom control but requires ongoing daily administration, carries potential side effects, does not address underlying causes, and needs a prescription.

Cytopoint (Lokivetmab)

A monoclonal antibody injection that neutralises interleukin-31, a key itch cytokine, with effects typically lasting 4 to 8 weeks. It offers sustained relief and is generally well tolerated but does not address root causes and requires veterinary administration.

Antihistamines

Medications that block histamine receptors. Options include diphenhydramine, cetirizine, loratadine and chlorpheniramine. They are only effective in roughly 10 to 30% of allergic dogs and may cause drowsiness. Natural antihistamines such as quercetin offer alternatives without pharmaceutical side effects.

How Probiotics Complement Conventional Treatment

Probiotics are not direct replacements for pharmaceuticals in severe cases, but they complement them: addressing root causes while medications suppress symptoms, potentially reducing medication dependence over time, supporting health safely alongside Apoquel, Cytopoint and antihistamines, helping maintain remission in milder cases, and restoring gut balance after antibiotic courses for secondary infection.

Complementary Nutritional and Natural Strategies

Diet and topical care work alongside probiotics to reduce the inflammatory load on the skin.

Foods to Avoid for Dogs with Skin Conditions

An elimination approach helps identify triggers. Common culprits to reduce or remove include high-allergen proteins (beef, chicken, dairy, eggs), high-glycaemic and refined carbohydrates including corn, wheat and soy that can feed yeast, artificial preservatives and additives, sugary and processed treats, histamine-rich cured or fermented foods, and overly fatty or fried foods.

Foods to Include

Helpful additions include omega-3 fatty acids from algae or flaxseed oil to reduce inflammation and support the barrier, antioxidant-rich vegetables such as spinach, kale and carrots, zinc from pumpkin seeds, vitamin E, and low-glycaemic vegetables, all part of an anti-inflammatory approach to skin.

Probiotics work best alongside a diet that removes triggers. For allergy-driven itching, pair them with a vegan dog food for itchy skin and allergies.

Natural Remedies for Itchy Skin

Topical and natural options that provide symptomatic relief include coconut oil for moisturising and antifungal support, apple cider vinegar diluted 1:1 (never on broken skin), oatmeal baths, aloe vera gel, calendula extract, and turmeric for its anti-inflammatory curcumin. These ease symptoms while probiotics and diet address the root cause.

When to See Your Veterinarian

Probiotics and dietary change manage many cases, but professional care is essential when symptoms are severe or infection is established.

Seek veterinary attention if itching is severe or causing self-injury; there are open sores, bleeding or signs of infection (pus, swelling, heat); symptoms spread rapidly; there is no improvement after 4 to 6 weeks of consistent probiotic use and dietary change; you suspect a secondary bacterial or yeast infection; the ears are affected; your dog develops systemic signs such as lethargy, loss of appetite or fever; the skin becomes severely thickened or darkened; or hair loss is extensive.

At the vet, expect a medical history, a thorough skin and ear examination, and diagnostic tests that may include skin cytology, skin scraping, fungal culture, a food trial, allergy testing or biopsy. The best outcomes usually combine conventional and natural approaches: address acute symptoms first, then build a long-term plan that includes dietary modification, probiotic supplementation, environmental management and regular monitoring.

How Bonza Supports Skin Health

Bonza is built on the principle that the gut shapes the skin, so its food and supplements are designed to work across the gut-skin axis rather than on symptoms alone.

Bonza Superfoods and Ancient Grains plant-based dog food includes a clinically researched, spore-forming probiotic, Calsporin® (Bacillus velezensis, previously classified as Bacillus subtilis C-3102), known for its resilience and efficacy in supporting gut and skin health. Combined with prebiotics and the next-generation postbiotic TruPet™, which research has shown positively impacts skin and coat health indicators while modulating immune responses¹¹, this synbiotic combination provides comprehensive support for dogs with skin conditions.

Bonza Block Bioactive Bites add Lactobacillus helveticus, a strain specifically selected for its documented skin benefits⁸,⁹, alongside Calsporin® probiotic, TruPet™ postbiotic, potent natural antihistamine botanicals and skin-nourishing nutrients. Block is formulated to reduce the itch-scratch cycle, calm allergic responses, support healthy skin barrier function, and build resilience against environmental, food and flea triggers with ongoing use. You may also find Homemade Probiotics for Dogs and our guide to the next-generation probiotic supplement helpful.

Shop Block Bioactive Bites for Itchy and Allergic Skin

Frequently Asked Questions

---

Conclusion

Canine skin conditions are rarely just skin-deep. From itch and allergy to recurring infection, they are frequently driven by an imbalanced gut microbiome acting through the gut-skin axis, which is why probiotics, working from the inside, can make a meaningful difference. The evidence has moved quickly: the 2024 trial showed faster relief from itch, and the 2026 Adelaide study showed oral supplementation can reshape the skin’s own microbiome and reduce the bacterium behind most skin infections.

Used well, with the right strains, consistent dosing, dietary support and veterinary guidance for severe cases, probiotics address root causes rather than only suppressing symptoms. That is the gut-first principle behind everything Bonza makes: support the microbiome, and you support the whole dog. One Gut. Whole Dog.

Related Articles

• Best Probiotics for Dogs: A Canine Nutritionist’s Guide
• The Gut-Skin Axis in Dogs: Skin Health Implications
• Probiotics for Dogs with Allergies: A Primary Nutritional Intervention
• Spore-Forming Probiotics for Dogs: Calsporin®
• Gut Dysbiosis in Dogs: Causes, Symptoms and How to Restore Balance
• Probiotics for Dogs: A Comprehensive FAQ

References

1. Tate DE, Tanprasertsuk J, Jones RB, Maughan H, Chakrabarti A, Khafipour E, et al. A randomised controlled trial to evaluate the impact of a novel probiotic and nutraceutical supplement on pruritic dermatitis and the gut microbiota in privately owned dogs. Animals. 2024;14(3):453. doi: 10.3390/ani14030453. PMC: PMC10854619.
2. Olivry T, DeBoer DJ, Favrot C, et al. Treatment of canine atopic dermatitis: 2015 updated guidelines from the International Committee on Allergic Diseases of Animals (ICADA). BMC Vet Res. 2015;11:210. doi: 10.1186/s12917-015-0514-6. PMID: 26276051. PMC: PMC4537558.
3. Felten V, Turck JL, Unterer S, Favrot C, Suchodolski J, Fischer NM, Rostaher A. An insight into the gut microbiota of healthy and allergic West Highland White Terrier dogs. PLoS One. 2025;20(8):e0328100. doi: 10.1371/journal.pone.0328100. PMID: 40864614. PMC: PMC12385407.
4. Rodrigues Hoffmann A, Patterson AP, Diesel A, et al. The skin microbiome in healthy and allergic dogs. PLoS One. 2014;9(1):e83197. doi: 10.1371/journal.pone.0083197. PMID: 24421875. PMC: PMC3885435.
5. Xu H, Huang W, Hou Q, et al. Oral administration of compound probiotics improved canine feed intake, weight gain, immunity, and intestinal microbiota. Front Immunol. 2019;10:666. doi: 10.3389/fimmu.2019.00666. PMC: PMC6454072.
6. Pilla R, Suchodolski JS. The role of the canine gut microbiome and metabolome in health and gastrointestinal disease. Front Vet Sci. 2020;6:498. doi: 10.3389/fvets.2019.00498. PMID: 31993446. PMC: PMC6971114.
7. Sordillo A, Heldrich J, Turcotte R, Sheth RU. An indole-rich postbiotic reduces itching in dogs: a randomised, double-blinded placebo-controlled study. Animals. 2025;15(14):2019. doi: 10.3390/ani15142019. PMC: PMC12291873.
8. Kim KA, Joo HM, Ahn YT, et al. Effect of Lactobacillus helveticus HY7801 on atopic dermatitis. Korean J Food Nutr. 2020;33(2):165-172. doi: 10.9799/ksfan.2020.33.2.174.
9. Bisyuk Y, et al. Combinations of probiotic bacteria (Lactobacillus helveticus, Bifidobacterium longum, Lactobacillus rhamnosus, Saccharomyces boulardii) restore the skin microbiome in atopic dermatitis. J Allergy Clin Immunol. 2023;151(2):AB139. doi: 10.1016/j.jaci.2022.12.437.
10. Khosravi M, Avizeh R, Zayerzadeh A, Gharibi D, Razijalali M. Effect of Bacillus subtilis and Bacillus coagulans spores on induced allergic contact dermatitis in dogs. Vet Med Sci. 2024;10(3):e1410. doi: 10.1002/vms3.1410. PMID: 38501344. PMC: PMC10949178.
11. Wilson SM, Oba PM, Koziol SA, Applegate CC, Soto-Diaz K, Steelman AJ, Panasevich MR, Norton SA, Swanson KS. Effects of a Saccharomyces cerevisiae fermentation product-supplemented diet on circulating immune cells and oxidative stress markers of dogs. J Anim Sci. 2022;100(9):skac245. doi: 10.1093/jas/skac245. PMID: 36044986. PMC: PMC9433306.
12. Grant L, Mohammadi Dehcheshmeh M, Ebrahimie E, Khabiri A, Veltman T, Shipstone M, Trott DJ. The effect of daily oral probiotic and postbiotic supplementation on the canine skin microbiota: insights from culture-dependent and long-read 16S rRNA gene sequencing methods. Vet Dermatol. 2025;36(6):581-592. doi: 10.1111/vde.13353.

Editorial Information

Field	Detail
Published	11 January 2025
Last Updated	June 2026
Reviewed by	Glendon Lloyd, Dip. Canine Nutrition (Distinction), Dip. Dog Nutrigenomics (Distinction)
Next Review	June 2027
Author	Glendon Lloyd, Dip. Canine Nutrition (Distinction), Dip. Dog Nutrigenomics (Distinction)
Disclaimer	This article is for educational purposes only and does not constitute veterinary advice. Always consult a qualified veterinarian before making changes to your dog’s diet or healthcare routine, particularly if your dog has existing health conditions or is taking medication.

---

---