My dog is weird. He will get loose stools for no aparent reason. At least one a day is looser then the rest. He gets a fish based food, and veggie cookies, and sometimes fish treats (like wellness whitefish and sweetpotato cookies). He also gets carrot sticks and brocolli, and beets and peas and bananas. I was trying to see if there is a pattern but there isn't. He can have turkey with no ill effects, as well as lamb and rice. He doesn't get loose stools with new foods, it's all random. That's why I was considering getting allergy testing for him.
The only thing that is consistant is his regular food, unless he is allergic to something in that.
Prevent a litter
Fix your critter