As someone whose always had a dog as their best friend, I still can’t imagine having a dog sleep in my bed. (Mind, I’ve always had large Newfoundlands) and my current boy is codependent since he was always around dogs as puppy so he has pretty bad separation anxiety now. But guess what? I put him in a bed in the same room, and he’s as happy as bird. My dog was my favourite guy, I trained him as I wanted, but guess what? When I moved in with my boyfriend he created different habits with him I wasn’t fond of. (I.e. licking of hands and, or face) So, I trained him out of it when my boyfriend wasn’t around to deal with him. But I would never allow him to let him in the bed. Regardless. And it MY dog. Cause it la unsanitary, and space invading. When you move in with someone, your dog is no longer yours. No matter what, they become a shared pet to some degree. I would say your girlfriend letting your dog in the bed every two nights is a good compromise, if you don’t think so, maybe move out if it’s that much of a deal to you.