We raise mice and rats for feeders and our daughter Christy has has pet Rats for a while. She would breed them and sell them to the Pet store with the understanding that they would not be sold for feeders. She does not breed them anymore now. The store would not take everything her rats produced.
We keep the pets and feeders seperate and when Christy's Rats Die they are not used as feeders. She has a little Place out in the country that she brings all of them. (this has been going on for a few years now)