I live next to a very busy road, so I made the descion to keep Kioto, my 9 month old kitten, in doors. But I will leave the door open with the screen door shut so she can hear and smell everything. Someones cat comes to visit her, a bit black fluffy one that is very sweet and might be a stray. But then comes the calico female, who will go up to the door and try and scratch at my cat and hiss sending my cat running for the hills...what do I do?