Whew, I am relieved to know that Jack isn't the only one! I have also had to be stern in my training with Jack, he never gets tired of testing me. I am starting to see a theme with the aggressive mothers though, apparently a dominant mare makes for dominant babies period.
Strangely enough, I have put Jack in with the most aggressive horses on the farm and except for one of his half sisters(that is kind of a nut, to be blunt, and is MEAN to other horses) he ends up buddies with them! Then they team up to pick on less dominant members. I put him in with the biggest strictest mare on the farm and they ended up eating hay out of the same pile. I am hoping that he will continue to mature and back off a bit like Snowkickers boy, he is JUST 5.
I am curious about the intelligence level of our geldings? We all love our babies, but we have to be honest and say that some are sharper than others. Jack is a problem solver, I swear he grows thumbs at night. I have to double and triple lock things to keep him contained. He has also let the entire herd out once or twice. He flips light switches in the run in if you don't hit the breaker, takes off his halter, unties himself, you name it he does it.