i shouldn't give any advice on this because I am a property manager for many many rental homes and would not want to contradict myself...but I will wish you all the best luck
on a legal standpoint...it is grounds for eviction. the only reason I mention this is because what if your apt. community gets a new mgr and this one that you have a good relationship with leaves...then you could be up a creek. it could very well come down to "the dogs go or you go". just please be careful. I've seen stuff like this happen many times. it is just heartbreaking.