The following is a document prepared by Hill’s Nutrition that gives a mile-high overview of the Microbiome in the GI tract of dogs (Cats and people too) It’s a zone of bacteria that do FAR more than ‘digest’. The bacteria may even have endocrine function whlie they DEFINITELY mitigate the immune system and certain other pro and antibiotic functions.
welcome-to-the-world-of-microbiome.pdf