The guides
Oral probiotics: which strains work, and what to expect
Pillar guide · every claim linked to PubMed
Probiotics for dogs: what helps, what's hype, and the numbers
Pillar guide · includes cats
The best oral probiotics for bad breath, judged by the studies
Roundup · none of the picks pay us
Probiotics for dogs with diarrhea: what to do tonight
Practical guide · vet red flags first
We read three years of r/badbreath: what 11,550 posts say actually works
Data study · counts, ratios, verbatim quotes, CSV
Weissella cibaria CMU (OraCMU): what the three trials found
Strain deep-dive · the strain in Green Breath
Streptococcus salivarius K12: what this strain actually does
Strain deep-dive · caveats included
Is your pet's probiotic actually dosed right?
Our free calculator works it out from studied doses, not label marketing.
Run the dose calculator🔬
85% vs 30%People with substantial breath improvement at one week, K12 versus placebo, in the strain's key trial.
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3.9 vs 6.6 daysHow long dog diarrhea lasted with and without the studied probiotic dose in a randomized trial.
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27%Share of animal probiotics that actually met their own label's count when researchers checked. We only cite products honestly labeled.
Oral health
Oral probiotics
Strains like S. salivarius K12 and M18 colonize the mouth, not the gut. We cover what the evidence supports for breath, plaque, and gums, and what to expect week by week.
Read the full guide →
Dogs and cats
Pet probiotics
One of the few pet supplements with real veterinary trials behind it. Species-appropriate strains, honest dosing, and when the right answer is a vet instead.
Read the full guide →Gut basics are coming. CFU counts, why strain identity beats species names, and how to read any probiotic label critically. The oral and pet guides above already use that lens.
How we work
Strains, not speciesEvery recommendation names the exact strain and dose studied, not just the genus on the label.
Receipts, not vibesClaims link to the underlying research on PubMed, and we say plainly when evidence is thin.
Paid, and honest about itSome links earn us a commission. They never decide what we recommend, and our disclosure policy shows how that works.