In cats, excessive chewing and sucking is just one of the strange habits some cats pick up. There is also hunting and pouncing at unseen prey, running and chasing, paw shaking, tail chasing or foot chewing, and severe over grooming that could lead to your cat companion pulling out its own fur and chewing himself raw. There may actually be genetic predisposition to some of these behaviors. For example, wool and sock sucking, is more common in Oriental breeds of cats.