It takes Willie so long to go through a bag, that I change every bag or two for sure.....no set kinds.....He will eat anything, and he seems to like when we change and he eats better....With him, it's like he gets bored with it and hardly eats at his twice a day feedings, so switching helps him.....he is lean enough.....LOL.....Right now we are on the end of the bag of CORE (finally) and going to California Natural, Herring and Sweet Potato.
Good Luck!
Good Luck!
