I can see why you are && my story is I had Calitt first & she was aggressive at every other animal whether it be in or out.. Then like you wanted another cat && OMG you would have thought the world came to an end.. Oh not what you think = she was aggressive with me when I brought home the second cat = now mind you I kept the new baby in a separate bedroom & let them growl & sniff each other under the door way.. Then one day I said it was time & slowly got them to touch noses & there was still hissing & growling & finally Calitt gave in & now I am a proud house hold of six babies in the house & all get along.. See after the second one it got easier & easier for Calitt to acept all the others..