I try to keep the food the same so they don't get too picky. They get dehydrated food added to it for dinner and I'll switch that up. Cat gets 4health indoor cat food and proplan wet foodI have a chi / terrier mix. She gets either the salmon or the duck. We switch it up now and then for her.
I used to have a cat that we had to keep changing her food. If you kept her on the same food for very long she'd break out in scabs really bad. But if we alternated good brands like 4health, blue buffalo, etc she wouldn't break out like