I agree with demaglio the Pit Bulls are very nice dogs to have every one I have ever known that had one is a lover of the breed. some Pits might be dog aggressive but no more then others in the terrier group. My favorite dog I had growing up was a Tibetan Terrier, he was the most loyal intelligent dog ever and yes he was dog aggressive. Your families activity level also could be a factor to consider when picking a dog. Check out AKC.org for more breed descriptions.