It's too obtuse of an idea. I can't imagine being in a situation with that choice... An awful lot needs to go wrong for that to be a foreseeable scenario... so the point is moot.
I would have little difficulty buying a steer to raise for beef... But I see a clear difference in the relationship a steer would come to expect from me. My trouble with maltreatment of pet animals is in the breach of trust, as I said. Other predators don't lie to their prey to make them easier to handle when you go to kill them.
There is no TRUST to build in dog farms.