Do I take the dog....?

I'm in an abusive relationship. About 4 months ago, my boyfriend bought me a $2000 dog. He bought himself one too. Everytime we fight, he threatens to sell mine because he knows how much I love him. Only when we fight, does it become "his". He has never even fed either one of them. They are solely my responsibility.

If I leave, do I have any rights to take the dog? The papers haven't been turned in so the only thing he has on the dog is whatever paperwork he filed out with the breeder. This dog is my baby :( I know if I leave, he will just sell him anyway. Plus, if I leave, I'm going into hiding... What do you think?

Edited to add: I am on all the vet papers, hes only listed as an emergency contact. I may can find the papers, if I'm not mistaken, they have to be filed through something anyway. I mean... If I leave, I'm taking his unborn child so he is already going to be mad (which is why I have a safe place in line). The dog has major money potential because of his breeding and what he will produce, so it will be a bigger loss to him than 2 grand. He plans on breeding him later.

Could there be any consequences, like.... would I be breaking any laws? I dont want to get in any trouble :(