Till The Cows Come Home
If you are raising Elsie, your cow, are you allowed to feed her non-kosher? The question would seem mostly non-sensical. However, care must be taken to avoid a prohibition, since the steaks may be high.
Basar BeChalav
Pet Food With Milk and Meat in the Gemara
Why pet food containing cooked milk and meat may not be used or returned for credit, since it is forbidden to benefit from it.