I have unintentionally been rotating because I was on a quest to find a food I liked (started on Eukanuba then Chicken Soup and now EVO). I almost finished one bag until there was just enough to do a week or so transition to the new bag. My plan was to stick with EVO because we really like it but the more I think about it the more I think I'll try something else next time just for variety. Mojo gets really excited about his food for the first half of the bag and by the middle I can tell he's bored with it so I figure I'll keep mixing it up.