We have this puppy... who is making me crazy!!!! She is a nearly 6 month old bullmastiff. She has recently decided that it's acceptable to put her face on the dining table to grab a piece of cake when no-one is looking. We were told by the breeder that bullmastiffs are very sensitive to the tone of your voice; all we would need to do is speak in a stern voice and she would know not to do things. It is not working!!!!! She jumped over the back of the couch yesterday, clearing the table behind it while in pursuit of the cat. Any advice on making her listen?????? Please? Anybody?