I don’t really have an answer to that, it is an interesting question. For me personally I don’t hold any attachment or feelings to the bodies of the deceased. When I die I’m getting one of those mushroom suits that decomposes you and quickly returns you to nature. But some people are much more attached to the bodies of the deceased whether for spiritual reasons or otherwise and I can’t really speak for them. Would eating the euthanized pets cause suffering to their previous owners, I really have no answer for that, I assume there would be some people who would suffer from that and some who wouldn’t mind. The quality of the meat I think would be very low though considering it would mostly be very senior animals with many health issues.