Like other large dogs they have a calm temperament, are a simple dog to train and require little grooming. Despite their giant size the Mastiff is actually a rather docile creature. They are even easy to have defenses to house-train. The young Mastiff is full of energy and can be rather boisterous, persistent and overall a handful. They have their fair share of health issues, such as hip dysplasia, heart defects, bone problems and obesity, but as long as they are gulping fresh air they seem to be able to live a long good life. A Mastiff will watch over his family with guardian instincts, making him the ultimate watch dog. Although they are not an aggressive breed, if they feel their family is threatened they will take down the whoever is doing the threatening. They can even turn on suspects and not let them get away with a beating.