Do pampered modern dogs even know that meat comes from animals? My guess is that my dog didn't. He wanted to chase animals very much, I never let him catch one, but I suspect that he wouldn't know what to if he did. On the other hand, when I let him chase me he would try to trip me by grabbing my pants at my ankles, which might be a wolf behavior.
(My ferrets didn't even know that meat was food, because they refused to eat anything expect their pellets. They wouldn't touch something like wet cat food even if they were hungry. I read somewhere that ferrets don't eat anything that their mother didn't teach them to eat when they were young.)
My dog had nightmares sometimes, or at least I think he did. He would twitch and do his sad/pain squealing noise. I woke him up whenever I noticed him doing that, and he always woke up calm and happy. I don't think he remembered his dreams at all.