Hi,
We took in a new kitten in November. Our two year old resident female was not too happy, but with a gradual introduction, they were become quite good friends. However, we had to take the kitten to get neutered and when we brought him home our female was growling and hissing again! We separated them for a while and eventually let them roam freely when we went to sleep. This morning she was growling and hissing again. Do we have to re-introduced them? How long will it take this time???

