DP and I moved in together shortly after he got a cat, so yes I did move in with him knowing he has a cat (cat is 4). He always knew I wanted a dog the moment I had a garden though and was never against it, he just admitted he will always be a cat person and his cat will probably stay favourite. He was on board during the whole process, etc. we ended up adopting a puppy that had been in foster here after living in a Spanish rescue. Lovely dog who is now 10 months and only 6kg, so very small. He used to sleep with the cat and now does nothing but chase it and if he grabs her, takes fur out, etc. he’s blaming me, saying I never did training around cats but yet there was 0 issues until this last month where I’m trying but not sure what to do. His cat now hides almost all the time but does come out when it needs food, etc. he wants me to have the dog on a lead at all times and I’ve explained that’s completely not feasible at this stage and he said I should have done that from day 1, I am not sure why he keeps going on about what I should have done when he was a younger puppy because HE WAS FINE WITH THE CAT THEN. He’s basically concluded that if I refuse to have him on a lead basically the whole time he’s in the house, he has no option but to move out. We have only just quite recently bought, so it’s going to be a nightmare. I’m not entirely sure what I can do, I’m trying to train him the leave it command (he’s fine when it’s good or things, but not so effective with the cat but I’m obviously working on it) I always try to get his engagement when he sees the cat but he doesn’t engage until he is done chasing it, etc. I do feel it’s just a bit of a natural behaviour and there’s nothing more I can do really, which is winding him up the most but then is only offering solutions that would be cruel to the rescue… AIBU or is DP?