My pet, the mountain goat

So i was playing D&D when i realized that animals are our slaves for the most part. We call them pets because it's much more pleasant...admit it. Anyways, i wanted to say that i want a mountain goat for a pet. Is that even legal??? But if it is then i would have s much fun with it. I would teach it to be like a dog and my house would be it's mountain....Yes America, i am a little insane. HAHAHAHAHA