^^^^ The guy in the pic (my younger brother) is 6ft tall, for a height reference.
My mom's mare foaled on the 4th of July. He is absolutely drop dead gorgeous, and already sold. He's a month and a half old in those pics, and he just passed the 10hh mark. Purebred Tennessee Walker. I'm working with him until he is weaned, and he has come miles from where he was at birth.
From the moment he hit the ground, he bucked, kicked, bit, struck, lunged, etc. With the help of two of my older disciplining broodmares, he stopped that in less than a week. Now, he is an angel. Other than the biting. As long has he has something in his mouth (lead rope, halter, tree branch, whatever he can grab) he is a dream to work with. Take it away, he bites at whatever he can get. He is the most friendly little thing you've ever seen, he loves people, but we can't get too close to him because of biting.
Nothing seems to work. Swatting him on the nose, tapping his side with a dressage whip when he bites, making a loud noise, etc. The thing that makes it worse is his mother is among the worst I've ever seen, and she lets him bite her and push her around. He's out with her and two other broodmares who won't take his behaviour, which has helped a lot.
Any ideas? I've already tried a lot of things, but I'm open to trying anything at this point.