My husband and I have 4 dogs, a boston terrier, a lab/sheppard mix, and 2 pit bulls. ALL are spoiled rotten and for the most part would be useless. However they all are great at alarming of unusual sounds and a few individuals that have entered our home invited have been given a up close and personal "once over" by our male pit. The female pit is more on guard and would be my guess the one that would be more likely to protect and defend property/people. Even though the lab/sheppard mix and boston terrier are the smarter of the group, they really do nothing special except give unconditional love.