Dogs get diarrhea for lots of reasons—diet changes, stress, scavenging, parasites, or antibiotics—and while probiotics won’t fix every cause, the right formula can help restore balance fast. Targeted strains add “good” bacteria that crowd out troublemakers, produce short-chain fatty acids to firm stools, and support the gut barrier and immune response. In this guide to the best probiotics for dogs with diarrhea, we highlight products with canine-studied strains, billions of CFU guaranteed through end of shelf life, clean ingredient lists, and strong quality controls (GMP/NASC, lot-level testing).
The Link Between Diarrhea In Dogs & Probiotics
Diarrhea in dogs typically indicates that the gut microbiome and lining are upset—often due to a change in diet, stress, scavenging, parasites, or the use of antibiotics. Probiotics add beneficial microbes that out-compete troublemakers, produce short-chain fatty acids (which feed colon cells and help firm stools), strengthen the gut barrier (more IgA, tighter junctions), modulate inflammation, and can reduce antibiotic-associated diarrhea. In practice, a dog-appropriate probiotic (clear strain names, billions of CFU guaranteed to end of shelf life) may shorten the duration and improve stool quality, especially alongside a bland diet for dog diarrhea and hydration.
How To Pick The Best Probiotics For Dogs With Diarrhea
Feature
What to Look For
Why It Matters
Strain-level ID & canine data
Named strains studied for diarrhea/AAD (e.g., E. faecium SF68, S. boulardii, B. animalis).
Targets loose stools with evidence vs. generic blends.
Guaranteed CFUs
Billions of CFU per daily dose, guaranteed through end of shelf life.
Ensures potency throughout recovery.
Rapid-response focus
Formulas suitable for acute diarrhea or antibiotic-associated diarrhea.
May shorten duration and improve stool form.
Gut-gentle excipients
Simple, low-fat, no artificial sweeteners (avoid xylitol), minimal flavors.
Reduces GI irritation during flare-ups.
Delivery form
Powders/capsules for clean formulas; chews only if gut-gentle.
Better tolerance and easy dosing with food.
Prebiotics used thoughtfully
Start probiotic-only or use gentle fibers (e.g., acacia); add slowly if needed.
Helps avoid gas/bloat in sensitive dogs.
Stability & storage
Shelf-stable or clear refrigeration; moisture/heat-protective packaging.
Protects viable cells so they work.
Dosing & timing
Weight-based; start at ½ dose for 2–3 days; give with food; separate from antibiotics by ~2 hours.
Improves survival and tolerability.
Rehydration compatibility
Pairs well with bland diet and electrolyte support.
Addresses fluid loss while microbiome resets.
Quality & transparency
NASC/GMP, lot numbers, third-party COA (purity, potency, contaminants).
Verifies safety and label accuracy.
Always consult your veterinarian before introducing probiotics toyour dog’s diet. You can get personalized nutritional advice from an online registered vet nutritionist through Vetster—available anytime, anywhere. You can also chat with an online vet and ask them questions about whether your dog could benefit from probiotics or which strains are best. Additionally, at-home dog gut health tests can provide valuable insights by analyzing your dog’s microbiome. Likewise, an at-home dog allergy test can help identify potential food sensitivities that may be contributing to digestive issues. Armed with this information, you can confidently choose the right probiotic and dietary strategy to support your dog’s optimal health.
Best Probiotics For Dogs
Here are the best canine probiotics of this year.
Best Overall Dog Probiotic For Diarrhea
4.9
★★★★★
Purina FortiFlora
Who It’s For: Dog owners seeking a high-quality, well-rounded probiotic suitable for all breeds and sizes, offering proven health benefits.
Why we recommended it: Most probiotics can help with the looseness of the bowls. Purina Pro Plan FortiFlora stands out because it has been specially formulated to promote normal intestinal microflora in dogs suffering from flatulence and diarrhea. For years, vets have recommended FortiFlora dog probiotics to help support digestive health, reduce gas, and manage the diet of puppies and adult dogs with diarrhea. It’s also an excellent probiotic for puppies with diarrhea.
What sets it apart from competitors: Proprietary microencapsulation guarantees the survival of the probiotic bacteria, so your dog gets the maximum benefits on each serving. This probiotic powder is perfect for all breeds of dogs at any stage of life. It comes in pre-measured packets to ensure your dog gets the ideal daily dose of probiotics.
Probiotics strains: Enterococcus faecium, vitamins E, B, and C, antioxidants, beta-carotene, and zinc.
Pros
Pre-measured sachets for easy serving
Contains antioxidant Vitamins A, E, and C
Enterococcus Faecium, zinc, and beta-carotene
Formulated by nutritionists, researchers, and veterinarians
Cons
A bit more expensive
Best Dog Chew Probiotic For Diarrhea
4.7
★★★★★
Ollie Probiotic Chews
Who It’s For: Pet parents who prefer a convenient, tasty, chewable probiotic for dogs with diarrhea that dislike powders or capsules.
Why we recommended it:Ollie Dog Probiotic Chews are scientifically formulated using five strains of probiotics to help improve digestion and promote gut health in dogs. Veterinarians recommend them for having a balanced and pleasant formula for your furry friend. We love that they boost their probiotic formula with all-natural digestive system-soothing ingredients in these chews, including pumpkin seed and papaya leaf powder.
What sets it apart from competitors: It is made using a cold extrusion process to preserve the potency of every active ingredient.
Why we recommended it:Open Farm is a pet food company that offers a range of dog products, including probiotics. They go to great lengths to source clean and organic ingredients to formulate their probiotics. These probiotics are vet-approved and developed as a part of their commitment to ethical and transparent sourcing practices. You can trace the origin of every ingredient in Open Farm probiotics on their website. Each Probiotic soft chew is made to help support normal gut flora and bowel movement, promoting healthy digestion and gut health.
What sets it apart from competitors: Open Farm is one of the most sustainable dog food brands. It has partnered with How2Recycle to ensure that its probiotic jars are 100% recyclable and do not end up in landfills.
Why we recommended it: Taking care of your dog’s gut health from an early age is essential. A puppy probiotic can help keep your puppy’s tummy happy and healthy. Whether you are looking for a probiotic for puppy diarrhea or want to support their digestion, immune systems, and well-being, The Honest Kitchen Instant Probiotic Goat’s Milk for dogs is a great choice. This probiotic powder supplement for puppies can be served as a nourishing drink by adding water or sprinkling it over dry kibble. It’s ideal for rehabilitation, digestive issues, and general immune support at the gut level for growing puppies. Serve over kibble, hydrate Honest Kitchen food, or offer it alone as a human-grade nightcap.
What sets it apart from competitors: It is made from highly digestible dehydrated goat’s milk from pasture-raised, free-ranging goats in the Pacific Northwest and digestive enzymes. Goat’s milk is especially great for puppies and kittens, as it helps support their digestion, immune systems, and well-being.
Probiotics strains: Lactobacillus case, Lactobacillus acidophilus, Lactobacillus bulgaricus, Bifidobacterium longum, and E. thermopilus.
Pros
Human-grade
No by-products, preservatives, or GMO ingredients.
Cons
One flavor
Cheapest Probiotic For Dogs With Diarrhea
4.7
★★★★★
Nusentia Dog Miracle
Who It’s For: Budget-conscious dog owners seeking an effective and affordable probiotic option without compromising on quality.
Why we recommended it:Nusentia Dog Miracle Probiotic offers excellent value for dogs, individuals with multiple pets, or those who require multiple servings per day. Nusentia provides the best quantity for your buck, with over 360 scoops per jar. Perfect for combating dog diarrhea, loose stool, yeast overgrowth, gas, bad breath, constipation, skin issues (including itching and scratching), allergies, digestive issues, and gut-related problems in pets.
What sets it apart from competitors: With over 360 billion CFUs of probiotics per jar (or 1 billion per scoop), this brand is confident in the effectiveness of its formula and offers a 60-day 100% money-back guarantee. Includes Inulin, a prebiotic.
Why we recommended it:Pawfy probiotics are a great addition to aid with better gut health. Pawfy dog probiotics can improve a dog’s gut health and digestive functioning thanks to their research-based formula. And because it’s jam-packed with natural ingredients (i.e., organic turmeric) and a perfect balance of vitamins A, D3, E, C, B1, B6, B2, and B12 for overall health, it helps boost the immune system and function and increases energy and overall physical well-being. These daily multivitamins and probiotic chews promote overall well-being and health. It has a tasty chicken probiotic flavor that can freshen your dog’s breath and maintain healthy bacteria.
What sets it apart from competitors: Additionally, it delivers pantothenic acid, manganese, folic acid, and biotin to support healthy anatomy and overall well-being.
Why we recommended it:Finn Digestive Dog Probiotics works hand-in-hand with top-notch veterinarians and canine nutritionists to create the best possible probiotic with the best possible ingredients. The Pumpkin, Inulin, and FOS found in Finn help ‘good’ bacteria flourish and stay nourished.
What sets it apart from competitors: The addition of prebiotics provides food and fuel to probiotics, helping to keep them healthy and active. The result is better digestion, enhanced nutrient absorption, improved immune function, and a healthier, happier pup.
Why we recommended it: If you have a small dog breed suffering from an upset stomach, diarrhea, gas, or are looking for the best probiotics for small dogs, Pawlife Soft Chews Probiotics for Dogs 3-in-1 formula is an excellent choice for small dogs. The 2 billion CFUs per chew is perfect for a small dog’s digestive system. Pro Pup promotes a balanced GI tract to support gas, bloating, constipation, diarrhea, indigestion, gut PH levels, and overall stomach discomfort. How much probiotics can I give a small dog? One soft chew per 25 lbs of body weight should work great for your pup. You can break the treat in half if your dog weighs less than 25 lbs.
What sets it apart from competitors: The soft texture of these mouth-watering, chicken-flavored soft chews is easy on small dogs’ teeth. Each soft chew is smaller than a nickel, perfect for a small dog’s mouth.
Why we recommended it:Nutramax Proviable-DC Health Supplement is a multi-strain probiotic supplement that supports a healthy intestinal balance in dogs. Each Proviable-DC probiotic capsule can help maintain intestinal balance during times of dietary indiscretion, dietary change, food sensitivities, loose stool, stress induced by travel or kenneling, weaning of puppies and kittens, metabolic disturbances, immune system-related gastrointestinal conditions, and other related issues. Whether your dog has a temporary case of an upset stomach due to boarding stress, antibiotics, or a sensitive system, ProViable probiotic capsules help restore balance. You can use this capsule in conjunction with a dog probiotic paste for extra support and effectiveness.
What sets it apart from competitors: It’s enhanced with two prebiotics, which support the growth of probiotics within the intestinal tract and help them compete against the harmful bacteria that colonize the intestines. The box contains 80 capsules, sufficient for up to three months.
Why we recommended it:Bene-Bac Plus Probiotic Pet Gel is made from 7 different bacterial strains that help crowd out bad bacteria, improve your dog’s appetite, and provide quick energy. Every Bene-Bac Pet Gel multidose syringe contains 15 grams of gel concentration of live-culture probiotic digestive bacteria. Each gram offers a guaranteed 20 million colony-forming units (CFU). Although this doesn’t seem like as many CFUs per serving, most customers have found the product very effective.
What sets it apart from competitors: Bene-Bac probiotics are fat-encapsulated to ensure maximum probiotic survival through the stomach acids of the digestive tract, allowing them to reach the intestines. The easy-to-use dial-a-dose syringe provides the indicated dose, making it simple to administer in any situation.
Another probiotic paste alternative is FullBucket Dog Probiotic Paste. It’s a highly concentrated yeast-based formula that supports natural gut defenses during periods of stress. It contains 12.5 billion CFUs of Saccharomyces cerevisiae boulardii per serving. This formula also includes prebiotics, digestive enzymes, and L-glutamine. It’s the ideal probiotic paste for dogs on antibiotics.
Pros
Easy administration
Dial-a-dose mechanism
1-year date code guarantee
1-gram travel tube for on-the-go treatment
Cons
Not as much quantity for the price
Gel options can get messy
Best Probiotics Spray For Dogs with Diarrhea
4.7
★★★★★
Florazil
Who It’s For: Busy dog parents looking for a probiotic spray that’s quick to apply and easy to use with any food.
Why we recommended it: Try Florazil+ Multi-Probiotic Food Spray for Dogs, our top pick for the best probiotic spray. It contains an assortment of probiotics that work to aid your dog’s digestive process. It comes in an easy-to-use bottle with 6 ounces of spray. The spray can be applied directly to your dog’s food, making administration a breeze. No refrigeration is necessary, so store it in a convenient location for you. These probiotics are microorganisms beneficial to your dog’s digestive tract, meaning this spray is all-natural. These microorganisms work by enhancing the good bacteria that are already present in the dog’s digestive tract.
What sets it apart from competitors: Enhances palatability for any food.
Why we recommended it:Mary Ruth’s USDA Certified dog organic liquid probiotic offers a proprietary blend (plant-derived and non-GMO) of probiotic strains. This blend is mixed in an enzyme-enriched substrate with water and a proprietary combination of 3 organic types of grass. Liquid dog probiotics are easily absorbed, unlike solid probiotics, which are treated with heat and chemicals. Liquid probiotics are always in their raw state, ensuring shelf stability and maximum potency. This product is human-grade quality, and the strains were explicitly chosen to support dogs’ health. You can add it to your dog’s food or serve it directly into their mouth. Customers report success giving it to their dog now, but you should try whatever works best for you and your dog.
What sets it apart from competitors: No refrigeration is required, and it can be stored in a cool, dry place.
Probiotics strains:Lactobacillus acidophilus, Lactobacillus casei, Bifidobacterium lactis, and B. breve.
Pros
Vegan
Non-GMO
Gluten-free
USDA organic probiotic
Cons
The bottle must be handled carefully, as it can break if dropped
Best Probiotic Powder For Dogs With Diarrhea
4.7
★★★★★
Honest Paws
Who It’s For: Dog owners preferring a versatile powdered probiotic to mix into meals for seamless feeding.
Why we recommended it: Honest Paws (a top CBD oil and CBD treats company) offers a blend of probiotics formulated by veterinarians, containing six strains of probiotic bacteria. It’s our top pick for the best dog probiotic powder. Honest Paws probiotics for dogs are a unique probiotic supplement that contains Solarplast, an extract of organic spinach rich in antioxidants, and their enzyme partners. Solarplast provides many benefits for healthy aging and optimal biological processes through restoration and repair.
What sets it apart from competitors: It includes Inulin, a natural prebiotic derived from Chicory that stimulates good bacteria.
Why we recommended it:Zesty Paws Probiotic for Dogs Gut Health is among the best canine probiotics. If your dog has a weak immune system, hot spots, allergies, and even bad breath due to poor digestion, this supplement can help Fido kiss goodbye to tummy trouble and other related issues. This brand enhances its formula with Papaya for digestive enzyme support, plus Pumpkin as a fiber and prebiotic source to aid motility and bowel movement in your canine. Along with all its digestive benefits, these tasty soft chews promote a healthy immune response to keep your dog healthy. Oh, and they are grain-free. This is great because it makes them easy to digest, promoting faster wellness for any puppy, adult, or senior dog.
What sets it apart from competitors: Zesty’s formula features Ganeden BC30, a premium Bacillus Coagulans probiotic strain that withstands stomach acid as it reaches the intestines to aid digestion, flora, and gut bacteria. GanedenBC30 helps absorb essential nutrients while promoting healthy bacteria to maintain GI health.
It contains garbanzo and pea flours, which might cause issues for some dogs
Handling & Storing
Did you know oxygen and high temperatures can cause probiotic bacteria to die rapidly? Probiotics for diarrhea are living microorganisms that have evolved inside your dog’s digestive system, as your dog’s gut is an anaerobic or oxygen-free environment. When you feed your dog probiotics for diarrhea, you introduce living bacteria into its gastrointestinal tract. If you want your dog to benefit from it, you must know how to keep them alive.
While good manufacturers help you accomplish this to some extent through packaging, there are some storing and handling practices you must follow:
Keep your probiotics for diarrhea in their original package or bottle. Their packaging has been specially designed to protect living bacteria. Moving them to plastic bags and glass jars may kill the bacteria, reducing the effectiveness of your probiotics.
Store them in a cool, dry place
Ensure they’re tightly sealed at all times.
Don’t open probiotics for diarrhea until you are ready to use them.
Discard expired probiotics as they are likely to contain fewer living CFUs
Some probiotics for diarrhea may need to be refrigerated. The manufacturer will generally state that somewhere on the package.
Never store them in a medicine cabinet in a bathroom where you shower. The heat and humidity from the hot water can kill the probiotics for diarrhea.
The Bottom Line
In conclusion, identifying the most suitable probiotic for dogs with diarrhea can be beneficial in promoting gastrointestinal health and alleviating symptoms. The use of probiotics helps restore the balance of beneficial bacteria in the gut, enhances digestion, reinforces the gut barrier, and modulates the immune system. By addressing the underlying causes and providing supportive care, probiotics can play a significant role in the recovery process for dogs experiencing diarrhea. When selecting a probiotic, it is crucial to consult a veterinarian who can offer expert guidance tailored to your dog’s unique needs. They can recommend the most suitable probiotic strains, dosage, and duration of supplementation. Remember that probiotics are not a substitute for addressing the root cause of diarrhea, and professional advice is crucial.
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