When I lived up in northern ca. on an Indian reservation I had a dog that stayed in my work van most of the time. If I said OK she would let you get stuff out of my truck if not you got bitten. She was a good girl. When I was working for a friend who knew the dog very well he thought he could just get in and grab a wrench...he was wrong. When Little Bit was in the van she was working. Best security around. She also helped pull wire under houses pretty good. Rod