It certainly can vary at dire times, that's for sure. For right now until I find the food that agrees with my Rona, Hershey, Allee, and Asha they get what those four have turned out allergic to. Sometimes dogfood companies will donate expired food bags at Petsense and I'll get thst as well. Linny's feed store sent me alot of samples for the rescues too so they get samples as well when I can get them unless one of them has a problem with it. Then they get what mine are on at the time as usually that good for sure doesn't bother them. I pay attention to ears, skin, hair for sensitivity . My Rona especially is my so sensitive skin one. No fish oil, chicken, or grains.
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