My chinchilla also has an obsession with feet, especially when the person is wearing socks. I dont know about the attacking, but it seems that some chinchillas just like to chew on clothing, and it appears that socks are a favorite. if your chinchilla ever deliberately bites you, try blowing on her face to let her know that she was bad. It doesnt hurt them and it teaches discipline pretty well. Snickerdoodle, my 7 month old male, has learned not to try to escape using this method. Good luck!