It is ideal that if you adopt a pet, you treat it like one of you're own. But that doesn't mean they are a slave if you don't treat them like youre own child. But think about it this way, didn't you like it when you're parents treated you nicely as a child? And wouldn't you want to treat you're child nicely? So that's how it is with pets, or not even you're own pets, just with any living things in general. What I'm trying to say is treat everyone nicely, and if you have a pet, sure treat them like you're own child, but you're pet isnt considered to be a slave if you don't.