Hi , I was just wondering if anyone can help me with a question about my house cats, now I have had these cats since they were kittens and they grew up together, they have all there shots and are both fixed, they are 2 females and they are inside cats, they do not go outside, now I left for work the other day and they were fine, 9 hours later when I came home it was like wild kingdom in my kitchen, and its been going on for a few days, now they are both eating and drinking and playing , no changes in them physically , but when they meet on the stairs or they are in the same room with each other its insanity, I am afraid that I am going to come home from work and one of them is going to be dead, I just want to know if this is something that I should be worried about or if they will work it out on there own, as I said I was not home when this first happened so I don't know if they were palying and one of the cats got a little rough and hurt the other , I am lost, I don't understand why my girls are acting this way, could someone please help me.