My cats have only adapted to the purina indoor formula and I told my husband - something was wrong. The last few months they won't touch it and they cont to whine like they are hungry. I got the purina naturals and they weren't too happy with that. It was all I would ever buy and I fig they must have changed the formula. My dogs aren't scarfing it down as they loved it when they use to get pieces here and there. It's frustrating. I have recently went through several bags of different foods and then my husband comes home tonight' with a huge bag of the indoor- again ... They rather be hungry . So now they have had lots of milk at this point .