I 've been going through the samething with Caiza. I was feeding Innova evo and then I tried regular innova and then I switched to NB. I like NB but there is always better. I seemed to figure out that he may have an allergy to chicken,turkey, etc. I then put him on NB venison and brown rice and it seemed to help him. His stool was finally firm again. Then loose stool happened again because he ate some of the cats food and he had blood in his stool
I put him on a bland diet of hamburg and brownrice for a few days and he was fine. I just bought a bag of Innova Red Meat and it is agreeing with him "thank god". I love the Natura dog food line. I will still cook for him to and boil him the brown rice to add to his food. I can get ground lamb, buffalo, and beef for him at my local grocery store. Instead of giving him the canned dog foods I'd rather make my own
Good luck with the foods, my vet told me to try the venison and brown rice first from NB and then if that didn't work out to then try the fish and potato.