my mastiff is chewing the carpet. i have tried the bitter spray but i think he likes it. he still will chew at it. we have a big dog door they come and go as they please we have a big back yeard and front. i take him on walks and we are doin puppy classes. he is 7 months old. the spots are in the hallway and in our room. so its not like there was food splitted there. we have two other dogs (not mastiffs) and they dont chew ont the carpet even when they were pups. just wondering if anyone has had problems with this eand what has helped..... he has chewed down to the wood. throw the carpet and the pad.