I am going to jump in here, as my company BiostarEQ, which is a whole food equine supplement company, recently launched our Canine line. http://www.BiostarEQ.com
Probiotic Miracle appears to have a very good CFU content (2 Billion CFU’s per serving) and are using a nice variety of microorganisms, particularly L. Salivarius (specific to the oral cavity) and L. Reuteri, which is getting a lot of action in European studies for its benefits to the small intestine. The formula does include prebiotics as well. Probiotic Miracle claims to be GMO Free (hopefully they will submit their formula for GMO free certification).
Naturvet, has a much lower CFU of microorganisms, and only lists one active microorganism: Bacillus Coagulans. However, it does contain digestive enzymes, and I would wait for Enzymesforpet to chime in on how therapeutically active the count is on the enzymes in this product.
If you are at all concerned with GMOs, you would probably not want to feed Naturvet, as it has several GMO ingredients in the base (vegetable oil, brewers yeast, papaya,lecithin). The dried fermentation product and solubles are possibly GMO. and the Bacillus Coagulans might be GMO, depending on if it was cultured from GMO yeast, or GMO bovine milk source.
While I am no expert on the micro biome, the research on the micro biota at large is pointing to the necessity of multi strains, capable of colonizing the entire GI tract, oral cavity, and respiratory tract. Colonization rates for canines is still speculative, but the range appears to be 1 billion CFUs to 5 billion CFUs (depending on the health or GI tract imbalance). Each dog, like each person, and each horse, has its own unique blend of micro biota, which is why one probiotic formula doesn’t work the same in every dog.
