Was she wrong to get the puppy? Where would you go from here?

11/24/20
“I have a dog that isn’t good around other dogs, and my roommate knows it. She just bought a black lab puppy and brought it home, and of course my dog absolutely hates her. They bark at each other all night and can’t be in our main space together without my dog growling at her. She says it’s our apartment so I shouldn’t be the only one allowed to have a dog. Was she wrong or am I being selfish?”
Pete Kelly - Weekdays 3-7PM