One of my daughters has a Pit (full blood). She is the sweetest dog I have ever seen. The world worst watch dog other then the normal Pit stare. That would scare anyone away, but the worst she would do is lick them to death. My other daughter has a Jack Russell. The only dog that I have ever met that hates me for some reason. And it isn't anything I ever did. We don't know what, but from the first moment she saw me to right now, the moment I am in view he starts to bark, growl and run back and forth. The only way it stops is when my SIL claps his hands real loud, The dog just runs for cover at that point. Even when he stops the barking he continues with a guttural growl if I get anywhere near. None of us can figure out why. He doesn't do that with anyone else. He is a rescue and all we can figure is that I must look like someone that did him harm at some point. I'd prefer a less intelligent dog with a short memory.