If a pet food has any probiotics sourced from milk etc. is it a problem if the pet food has meat also? or would any probiotics be of an insignificant amount in a dog food.
It is problematic. The reason is because the probiotics are milky and if the dog food contain beef, veal or other meat from a kosher animal, and the two were cooked or heated up together, then it is forbidden for us to derive any benefit from it. We can’t give it to our dog, or any other animal to eat, nor to a gentile to give to his dog. I can’t say with certainty that it is cooked together, but since it is very possible, and it would be a biblical prohibition to benefit from this food, don’t buy such products until you know for certain that it is not an issue.
PIschei Halacha pg. 182