Hello everyone! I work at a barn as an assistant trainer at a barn in Northern California. Recently I have been working with a young OTTB named Bruno. He is roughly 4 years old, raced briefly and then sat in a field for a while before being given to us. He is sweet tempered on the ground, very quiet… until you ask him to do anything that requires him to work. He is significantly weaker to the right. (Weaker being that he is less willing to track under himself with his right hind.) We have been lunging him with one side rein attached (inside side rein, that way he doesn’t feel restricted and can’t just hang on the side reins for support) and it is fairly loose.
He is fairly badly behaved on the lunge line and has even gotten away from one of the other girls who works with him causing havoc in the indoor when he decided to go ripping around the arena afterward. He has been known to go from 0 to 100 in .5 seconds and will lay all of his body weight into the person lunging him and if they aren’t experienced enough to control him, he gets loose. His friskiness really only happens when another horse is in the arena (passing or nearby). I had him in the outdoor one day with no one else in there and he was perfect, little to no pulling and no stupidity, so it leads me to think he might get claustrophobic/worried when other horses are near him. I had the idea of taking him into the round pen so that he can’t get away, and even if he did, he wouldn’t really have any place to go. (The reason I haven’t lunged him out there since I started working for my trainer, 2 months ago, is the round pen was closed for a while due to it being leveled and basically redone.) The round pen stopped the constant pulling and flying backwards, but instead when we were going right, he would constantly whip himself around and try to go left. Every time I did this, I would stop it almost immediately and make him go right, this happened about 6 times before he decided to actually listen and be quiet.
My questions is a) how in the world do I stop a horse like that from laying all his weight into the lunge line and pulling me across the arena? and b) was I right to bring him into the round pen so that he’s on his own and I can really work with him? Also any suggestions on getting him to be all together better on the lunge line would be welcome.