It is always really difficult to tell but I think that my cat was allergic to something in Wellness canned turkey and salmon. She kept getting yeast infections in her ears I have read lots of articles that suggest that yeast ear infections really are allergy related. She is a very picky eater so this was the one food she would eat. But I finally found a new food that she would eat - Instinct Pride rabbit and I have seen a huge difference. She has not had anymore yeast ear infections and has gained weight (she was a bit skinny before). So who knows if it was the meat or something in the food.