My cat is such a DOG! She stole a stuffed zebra from my roommate a couple of weeks ago and then a stuffed lamb of mine and carries them all over the house, wrestles them, throws them in the air, pounces, etc. I've never seen a cat do this before! I also never have a matching pair of slippers because she carries them off and hides them under the guest bed or just carries them through the house in her mouth. Is this a normal cat behavior?