Hi. My family has two cats, a tuxedo cat named Kevin and a black cat named Margo. They fight a lot, so I am getting new supplies and will reintroduce them soon. I joined this forum because I am concerned about Kevin. He tolerates almost anything and I've never heard him growl or hiss despite the fact that we've had him for 5 years. I can find no information on this online. I'll talk more about that on another thread once this is moderated, though. I hope that I will also be able to help other people out.