Ok a friend of ours has a mastiff. He's "young" ... just over a year old but he's obviously getting very large already. He had been letting him up on the furniture but now they have decided that perhaps that's not a good place for him to hang out because he kind of destroys what ever he sleeps on lol. So I know being consistent with telling the dog to get down and stay down is the biggest thing but are there any tips or tricks anyone has for him to help this process along? Basically he has to break a "behaviour" that was once allowed and now is not.