3 days ago I took my younger cat Amber for a teeth cleaning. ever since I brought her home Suki has been mean to her. growling, hissing and even swatting at her. what is her problem? they have been living together for 5 years. they were never really friends. Amber tried to make friends when I first got her but Suki wouldn't warm up to her. they eventually got to the point where they would just ignore each other and everything has been peaceful until now. why is Suki acting like this?