Studies in beagles, shih tzu, Labradors and miniature pinschers indicate that dogs have LOTS of bacteria in their gut.   Every day the dog excretes 1014 bacteria (that’s 10,000,000,000,000 bacteria)…..Prudence delivers either 1.6 or 2.0 BCFU or 1.6 x 109 or 2.0 x 109  (160,000,000 to 200,000,000)…the numbers sound large, but remember that there are more bacteria in the gut of a dog or of a human than there are cells in the entire body of a dog or a human! So, no, it’s not too many bacteria for a small dog.