I'm assuming that when a cat sticks her rear into the air it's to mate, right? Because Twix is doing this when my dog (Shaggy) tries to play with her. Shaggy and Twix have this game where they wrestle (they both love it). At different parts Shaggy takes Twix's head in his mouth. Now poor Shaggy is trying to play, but Twix want's to mate and is thinking that Shaggy is being the 'dominant male' when all he wants to do is play. Twix sticks her behind in the air and meows/coos/growls. Obviously she wants to mate so bad that she thinks that Shaggy is trying to mate with her. The only problem is that Shaggy is a dog. He's also a neutered dog. This is currently going on in our living room. Is there anything I can do to calm her down besides spaying? We're taking Shaggy and Twix in after our vacation (in March) to get shots and get Twix fixed. In the mean time, since I don't want kittens, should I keep Twix inside?