my 4 month old puppy has seemed to develop a liking for biting on clothes- sleeves, pant legs even shoes when we are in the house. I say " no bite" yet she doesn't stop and will continue to do so. She will also not let go, just keeps holding on. Please will this get better? Is this a foreshadowing to a bigger dominant/aggressive future dog? For the record we have trainers. But nothing beats the advice of other Berner owners.