4.3(2,269)Amazon rating$29.97600+ bought last month
Our verdict
Bark & Whiskers Complete Probiotics is a powder blend from Dr. Mercola built around 14 different bacterial and yeast strains, giving it one of the broadest strain counts in this category, and a 4.3 star average across 2,269 reviews reflects generally positive but slightly more mixed feedback than the category's top performers.
Owners who want a wide-spectrum multi-strain powder that can be sprinkled over food for either dogs or cats.
Skip if
You want the single highest-rated option in this category, since several competitors here post ratings above 4.5 stars.
Form Powder
Breed size Large, Medium, Small
Weight 0.35 Pounds
Priced 20% above the category median ($24.99 across 128 tracked models)
Our scorecard
4.3/5overall
Owner rating4.3/5
4.3 average across 2,269 owner ratings
Popularity3.7/5
2,269 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog food and health supplements we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
["This 3.17 oz (90 g) powder from Bark & Whiskers packs in 14 named strains, including several Lactobacillus, Bifidobacterium, and Streptococcus species plus Saccharomyces boulardii and Bacillus coagulans, a notably broad lineup compared to most single or few-strain probiotics in this silo. It's formulated by Dr. Mercola and sized for large, medium, and small dogs.", "The listing markets it for both immune function and digestive support, and it's labeled non-GMO, soy free, and gluten free, appealing to owners looking for a cleaner-label supplement. As a powder, it's meant to be mixed into food rather than dosed by syringe or fed as a treat.", 'At $29.97, it sits mid-range for this category, and with 2,269 reviews at a 4.3 star average and around 600 bought last month, it has a solid but not top-tier track record compared to some of the higher-rated options here.']
Pros
14 named bacterial and yeast strains, one of the broadest blends in this category
Non-GMO, soy free, and gluten free label claims
Powder mixes easily into any dog's regular food
Works across breed sizes and for both dogs and cats
Formulated by a well-known brand, Dr. Mercola
Cons
4.3 star average is lower than several competitors in this same silo
Powder format requires accurate scooping rather than a pre-measured dose
Some dogs may be pickier about powder mixed into food than a flavored chew
Specifications
Form
Powder
Breed size
Large, Medium, Small
Weight
0.35 Pounds
Performance notes
The sheer strain count here, 14 distinct bacterial and yeast species, is meant to cover more ground than a narrower formula, targeting both digestive and immune support at once. Because it's a powder, consistency depends on accurately measuring each scoop rather than relying on a pre-dosed capsule or chew.
What buyers say
A 4.3 star average across 2,269 reviews shows generally positive experiences, though it trails some of the higher-rated capsule and chew options in this category, and at roughly 600 units bought last month it has steady but moderate demand.
How many probiotic strains does this powder contain?
The label lists 14 different strains, including multiple Lactobacillus and Bifidobacterium species, Streptococcus thermophilus, Saccharomyces boulardii, and Bacillus coagulans.
Can I give this to my cat as well as my dog?
Yes, the listing targets both cats and dogs.
Is this powder free of common allergens?
The label states it's non-GMO, soy free, and gluten free, though always check the full ingredient list if your dog has a specific known allergy.
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