I think that it was a very bad sign that after discussing to get a dog together, he just went and got one for himself. Not a behavior acceptable in a healthy marriage regardless if buying a second dog is plausible or not.

Are you financially dependent on him? Unfortunately that’s often the reason for people staying in abusive marriages. How long have you been married? What do you intend to do? Abuse usually escalates. First he was controlling and jealous until you moved to be isolated. Then this dog. It won’t stop.