I was wondering the same thing! We have a kitten who adopted us by secretly riding home in the wheel well of our car..LOL. So...now he is ours. I spent alot of time introducing them and all was ok for a while. Now it is going in the wrong direction with marking, peeing and just plain old tormenting ozzy (our 10 yr old diabetic guy) Cosmo (kitten) is even causing my German shepherd stress! My husband is delicately suggesting Cosmo be more of an outdoor cat. Not to be mean but because of the concern of the added stress on ozzy. He is due to be neutered next week so I'm hoping that will help! Maybe the plug ins will help with re introduction after neutering??? Just really bad timing...we are in a new home , new state, new job, new to diabetes. And now new Cosmo..