PJ
Forcing a dog to eat all "plant matter" is actually quite different than forcing a deer to eat all meat products. Deer are herbivores. Dogs are omnivores. That means they can eat plant and animal "matter". Some (https://biologyofbehavior.wordpress.com/2014/02/09/are-dogs-and-wolves-the-same-species/) argue that they are detritivores. That means they are most accustomed to eating our leftovers and trash "matter". In any case, I'm not forcing anyone to eat anything and not all "plant matter". I feed my dog meat, just not every day and not very much. As I said, nuance. The world is not black and white.