[theBCnut]

Your other dog likely didn’t have an issue because for whatever reason his gut is healthier and already had a wider variety of beneficial bacterial to help battle the invaders. While Fortiflora is more likely to have a guaranteed number of the probiotics that it contains, it only contains a very limited number of strains. Try giving your dog some kefir, you’ll find it in the yogurt aisle, or a human probiotic with as many different strains as possible.