"I understand, Master." Voli knew that Fein was just comforting him. But it will take a few months before he could move on.
Fortunately, he didn't witness how they died or else the guilt would be bigger. In actuality, as a beast, he shouldn't feel bad since he had a different race than them. Just like how it was normal for humans to not feel bad when killing other races or beast. But like anything else... There's always an exception. A human who loves pet or has a soft heart might emphasize with pitiful animals. Of course, it's essentially a selective sympathy, a low-key hypocrisy.
Fein doesn't differentiate on what he would eat. Since he decided to eat meat since the day one, he doesn't have an issue eating dog or cat meat as long as it's not a pet that he raised.