Does anyone feed their cats different food? How do you get them to eat their own, and not the others? Butter is on a special food to increase the pH level in his urine, and Kiba eats regular food. I've been trying to feed them smaller amounts twice a day instead of always having food out. But they don't eat it all. I don't want them to be really hungry all day. How do you go about it?

Have any of your heard of cd food? That is what Butter is on now. Also, how long do you leave canned food out if they don't eat it all? Like how long before it goes bad?