You should get a Pit Bull!

Pit Bull

A pit bull is not a typical Terrier. In spite of bad media surrounding this breed, when properly socialized this short coated, athletic and loyal companion will be a great friendly lump ... at least towards humans. When provoked or threatened, and its deep-rooted instincts are triggered, a pit bull can be deadly to other pets. But the vast majority of these dogs live happily among other pets and children. At times, they can be inflexible in their behavior, but with consistent behavior enforcement will be obedient and friendly.

Needs: Training is a necessity. Get professional help if you need it. Frequent social time with people and animals will further reduce the chances of aggression. Otherwise daily walks and weekend play time is all that's needed to keep this dog in good spirits.