Partner (M31) wants me (F30) to choose between him and the dog

My partner (31M) and I (30F) have been together for nine years as of April this year. However, we only moved in together in July 2023. I’ve had a dog for almost eight years. The dog has, of course, lived with me most of the time, or actually always. We often met without the dog, so we had a lot of time together without the dog. However, he still spent a lot of time with the dog and considered it a shared pet, treating it as such. Since we moved in together, I haven’t had the dog with me all the time; I’ve only had him for a maximum of two nights a week because, since we’ve had the apartment together, there has been tension between the two of them. The dog has in fact been panting excessively. It’s worth mentioning that the dog is generally a more anxious breed, but it’s gotten worse in his environment.

In September of last year, I discovered that he was cheating on me. Since then, we’ve been trying to repair the relationship. We’ve been at it for five months now, trying to rebuild the relationship. During these five months, I’ve only had the dog in the apartment when he wasn’t around. He’s seen the dog for maybe 15 minutes in total over the last five months, which doesn’t really bother me. Right now, I don’t want the dog near him. Therefore, the dog spends a lot of time with my mother. The issue now is that he’s essentially giving me an ultimatum: either him or the dog. He believes the dog brings too much chaos and says I should decide. He wants the dog to stay at my mother’s house. He doesn’t seem to care that the dog is incredibly important to me and vital for my peace of mind. I just don’t know what to do.

Would you give up your dog for ur unfaithful partner?