These are the products whose own label claims something specific about diarrhea or loose stool -- not every probiotic on the site makes that claim, and we're only listing the ones that print it. A label claim isn't the same as a clinical trial on that exact product; check each product's own page and its linked strain pages for what's actually been studied in dogs versus what the front of the package says.
The label's own printed claims mention diarrhea, loose stool, or digestive upset by name.