If all the beasts were gone, men would die from great loneliness of spirit. For whatever happens to the beasts, soon happens to man. All things are connected.
Problems occur with cross-breeding to 'snappish' breeds or irresponsible upbringing.
The canine may be humanity's best friends, but humanity is sometimes not canine-friendly. Currently, the United Kennel Club and the American Dog Breeder's Association recognize and register the American Pit Bull Terrier as a breed. The AKC recognizes the American Staffordshire Terrier. Conformationally, the two breeds are very similar, and many dogs are dual registered. There are subtle differences, however.