As your Canine digests a scoop of probiotics, the effective bacteria will start to colonize and outcompete the dangerous germs in its digestive tract. This is certainly why they are called colony-forming models. Lactobacillus acidophilus. One of the more typical probiotics, this strain is present in lots of fermented foods https://www.amazon.com/Healthy-Treatz-Probiotic-Chews-Dogs/dp/B07VCGNM6X