I think my girlfriend is inconsiderate? Do you?

My girlfriend and I have been together for three years and living together for one of those years. When I FIRST met her I had a two young (5 months) pit bulls Jack and Karen. I told her that to love me she had to love my dogs. She was great with them, they're great dogs and very social and soon they became OUR dogs. So, last week she brings home this CrAzY rat terrier (WITHOUT CONSULTING ME) that has been terrorizing Jack and Karen since the day she brought him home. So after ignoring him for a week and letting him terrorize them Jack barked and growled at her little monstrosity and now she thinks I should put MY dogs out or crate them all day so her dog can run free. Her dog barks constantly, IS NOT house broken, and snaps at anyone who comes to the door. This has been an on going arguement. I feel she is inconsiderate for not discussing it with me before she got another dog? What do you think?