The personality of a dog is flexible and indeterminate. Dogs can be exuberant or shy; friendly or hostile; fearful or bold; aggressive or passive or some combination of the above. These differences in personality may to some extent be determined by breed, or individual genetics, but for the most part it is based on how and to what extent each particular dog has been socialized.
Dogs can suffer from a whole host of diseases and other serious health problems. Some of these conditions are inherited, while others are caused by viruses; still others are related to lifestyle and environmental influences.
When one thinks of the bulldog, the image that first comes to mind is probably that of the English Bulldog, with its squat build, round head and distinctive “face that only a mother could love.” But there is another kind of beloved breed of bulldog: bigger and more athletic, and ruggedly handsome where the English Bulldog is charmingly ugly. This is the American Bulldog, a breed that almost literally came back from the dead to become widely popular as both a working dog and a family pet.