If you're going to be carnivorous or omnivorous, arbitrary culturally-defined preferences about which meats you should and shouldn't eat are just that, arbitrary.
Show me someone's pet, I'll show you someone else's staple source of protein.
Drawing the line at human flesh is pretty much universal these days, but with six billion meat puppets walking around the planet these days, I'm not so sure cannibalism is a bad idea, Creutzfeldt-Jacob syndrome aside.
Just for the fun of it, Meat is Murder was a great Smiths album way back when. The natural evolution of that thought for me is that Murder is OK.