The Best Probiotics for Dogs: How to Choose What’s Right for Your Pet

By Ruth Roberts, DVM, CVA, CVH, CVFT, NAN.

When your dog has digestive issues like gas, bloating, diarrhea, or even skin problems, a probiotic might be one of the first natural solutions your vet suggests. But with so many options on the market, how do you know which is the best probiotic for dogs?

Rather than focusing on brand names, this guide will help you understand what makes a probiotic effective, and how to pick the right one based on your dog’s individual needs.

What Are Probiotics and Why Do Dogs Need Them?

Probiotics are beneficial bacteria that live in your dog’s digestive tract. These “good bugs” play a key role in:

• Support healthy digestion and nutrient absorption
• May help maintain a balanced gut microbiome
• May contribute to normal immune function
• May assist the body in managing inflammation
• Helping with issues like diarrhea, constipation, and even anxiety

A healthy gut equals a happier, healthier pup. But not all probiotics are created equal.

How to Choose the Best Probiotic for Dogs

1. Multi-Strain Formulas and Your Dog’s Specific Needs

While multi-strain probiotics can offer broad benefits, it’s important to remember that more strains don’t automatically mean better results. The key to choosing the best probiotic for your dog is matching the right strains to their specific health needs. Different bacterial strains play different roles in the body. For example:

• Lactobacillus acidophilus may support digestion and immune health
• Bifidobacterium animalis is often used to help manage diarrhea
• Enterococcus faecium has been linked to improved stool consistency

A well-chosen multi-strain formula can target multiple concerns at once. However, randomly selecting a product with many strains, without considering your dog’s condition, may introduce strains that aren’t helpful, or even counterproductive, especially if the gut is already imbalanced. The takeaway? Focus on quality and relevance, not just quantity.

2. Check the CFU Count (Colony Forming Units)

CFUs indicate how many live, active bacteria are in each dose. For dogs, a good probiotic will typically have between 1 billion to 10 billion CFUs per serving. More CFUs aren’t always better, but the product should deliver an effective dose backed by veterinary research.

3. Prioritize Stability and Shelf Life

Some probiotics need refrigeration, while others are shelf-stable. Either can work, but stability matters. Ensure the product uses protective technology (like freeze-drying or microencapsulation) to keep the bacteria alive until they reach your dog’s gut. Check the expiration date and storage instructions. Dead probiotics won’t help your pup.

4. Look for Added Prebiotics—but Use with Care

Prebiotics are non-digestible fibers that serve as food for probiotics, helping beneficial bacteria grow and thrive in the gut. Common prebiotics include inulin, FOS (fructooligosaccharides), and pumpkin fiber. When combined with probiotics in the same formula, they’re called synbiotics, which can offer more comprehensive gut support.

That said, not all dogs tolerate prebiotics the same way. While FOS can be beneficial in many cases, dogs with sensitive digestive systems or existing dysbiosis may experience worsening symptoms, such as gas, bloating, or diarrhea. In my experience, FOS can sometimes exacerbate GI issues in dogs with an already disrupted gut microbiome. For dogs with ongoing gastrointestinal problems, it’s best to introduce prebiotics cautiously, and ideally under the guidance of your veterinarian or a holistic pet health coach.

Match the Probiotic to Your Dog’s Health Needs

Probiotics can be a fantastic tool for supporting your dog’s health, but knowing when to use them is key to getting the most benefit. Here are some situations where probiotics can really shine:

Digestive Upsets
If your dog is dealing with diarrhea, constipation, or irregular stools, probiotics can help restore balance in the gut. Saccharomyces boulardii, for example, is particularly suitable for diarrhea and improving stool consistency. This yeast-based probiotic has been shown to improve stool consistency and reduce clinical signs in dogs with chronic enteropathies. A yeast-based probiotic works differently from bacterial probiotics, making it a great first step for acute gut issues.

After Antibiotic Use
Antibiotics can wipe out both harmful and beneficial bacteria in the gut, leaving your dog’s microbiome out of whack. Probiotics can help replenish the good bacteria and prevent issues like antibiotic-associated diarrhea. Saccharomyces boulardii is a top choice. This yeast-based probiotic is good because it’s not affected by antibiotics, meaning it can work alongside them without being destroyed. Another excellent option is a spore-forming probiotic such as Bacillus subtilis and Bacillus licheniformis. These spore-formers are incredibly resilient, surviving the harsh environment of the stomach and reaching the colon intact, where they help restore microbial diversity and promote a healthy gut barrier.

Stressful Events
Stress, whether from travel, boarding, or a big life change, can disrupt your dog’s gut health. Probiotics can help maintain a healthy microbiome during these times, reducing the risk of digestive upset and supporting overall well-being. A crossover study conducted by Purina found that giving anxious dogs a probiotic containing the proprietary strain Bifidobacterium longum NCC3001 (BL999) helped reduce signs of stress. After supplementation, 83% of the dogs showed lower cortisol levels in their saliva, and 75% had decreased heart rates when exposed to stressful situations, indicating a calmer, less reactive response.

Skin Allergies or Itchy Skin

Probiotics may benefit dogs with itchy skin by supporting a balanced immune response, strengthening the skin’s natural defenses, and encouraging a healthier microbiome. One notable example is Lactobacillus plantarum, which has been linked to reduced itchiness in dogs suffering from atopic dermatitis. A 2021 study by Ural et al. explored the use of a probiotic enema containing Lactobacillus plantarum and Lactobacillus paracasei, finding it significantly reduced pruritus in affected dogs.

Diet Transitions
If you’re switching your dog’s diet—say, from kibble to a fresh, home-cooked diet like the CrockPET Diet—probiotics can ease the transition by supporting gut health and reducing the risk of digestive upset.

Final Thoughts

The best probiotics for dogs aren’t about flashy labels or trendy packaging. What truly matters is choosing a product with the right bacterial strains, appropriate dosage, and an effective delivery method—all tailored to your dog’s specific condition and needs. By understanding what makes a probiotic effective and how it supports your dog’s overall health, you’re laying a strong foundation for their long-term wellness.

Dr. Ruth Roberts is an integrative veterinarian and holistic health coach for pets, as well as the creator of The Original CrockPet Diet. Learn more at drruthroberts.com.

References

D’Angelo S, Fracassi F, Bresciani F, et al. Effect of Saccharomyces boulardii in dog with chronic enteropathies: double-blinded, placebo-controlled study. Vet Rec. 2018;182(9):258. doi:10.1136/vr.104241

Ural K, Erdoğan S, Balıkçı C, Erdoğan H, İçaçan ŞG. Inovatif Gastroentero-Dermatoloji Kapsamında Muhtelif Yöntem Geliştirme I: Lactobacillus plantarum ve Lactobacillus paracasei ile Probiyotik Eneması Atopik Dermatitli Köpeklerde Anti-Pruritik Etkinlik Sağlar Mı?. Van Vet J. Temmuz 2021;32(2):74-81. doi:10.36483/vanvetj.941978