I just started home cooking for him this past weekend, but when I fed Izzy kibble I rotated every 3 months, which is about how long the 5lb bags would last. I rotated between: Merricks (his least favorite lol), Canidae (loved it!), Solid Gold Wee Bits and Wellness. I think it is a good idea to change too, plus you can get a good idea of what they really like.