Originally posted by Cheshirekatt
Here's my dumb question:

Why will dogs refuse to eat perfectly good dog food, but will gladly graze out of the litter box for kitty rocca?
Vet told me that cat food has nurtients that dog food doesn't, the cat's body doesn't use all of these nutrients so some of it ummm comes out the other end. Presto, mini buffet for the puppers.

My question though: How do the dogs know that the nutrients are in there and that they don't get them in their food?