Not sure where to post this; there have been similar threads, but none I’ve found quite relevant enough to my own situation.
I am starting a young horse for a friend. I have started a number of young horses (11-12) previously with no (minimal) issues. This guy is a 3 year old Hanoverian; big mover, about 16.1, but still growing and quite narrow.
I started working with him because he “unshipped” the previous trainer as soon as she sat on him for the first time. This horse has had months of groundwork - lunges nicely w/t/c (both by his owner, a knowledgeable adult ammy, and a DIFFERENT trainer than the one who got on him, who elected not to get on him after a month of groundwork for reasons that are not that clear) in side reins and/or chambon (my equipment of choice). He’s been fully sacked out; he’s had a dummy on him; he’s had people lay over his back for weeks. He is a very laid back guy; he’s been owned by the same owner since he was a yearling. He has been very well handled from day one, she has loaded him on and off the trailer, he has been off property ponied through the woods etc.
I lunged him for about a week: all good. Then a couple days laying over him and being led around, then another day or two adding mounting and dismounting from the block.
He is being worked 3-4 days a week (so sometimes he is worked two days in a row, sometimes a day or two in between).
Day 1 (Riding): he was perfect. Led around on a lunge line by the owner, everything went great.
Day 2: Get on him as I had the previous day. I sit on him, and about 5 seconds later, he scoots forward (from the halt) and explodes, broncing for several minutes until the owner has to let go of the lunge line and I ultimately come off. Immediately following this, spend considerable time laying on and off him and being led around, and leave him there for the day.
Day 3: Perfect. Now being lunged at the walk. Doing walk/halt transitions. Thinks about scooting a few times, but no real reactions.
Day 4: Perfect. More being lunged at the walk with walk/halt transitions.
Day 5 (Today): Perfect. Lunged at the walk again, walk/halt transitions, very relaxed. Until…I went to dismount (as I had clearly done many times). Halted. Swung my leg over. Horse bolts and I hit the dirt.
Okay…So I get back on and walk around. Always always always reassuring with voice and pats because he seems to be reacting out of panic. Horse has some more scoots, which I manage to control by taking contact and closing my leg. He’s not stupid - this is starting to reduce his reactivity, which seems positive.
Walk around for a while until he seems calm…halt…remove feet from stirrups (quietly)…aaand explosion. Straight up, in every direction; I manage to stay on through considerable hysteria. Continue to walk around. Now my question becomes…how am I going to get off this horse??
Despite pats and encouragement during quiet walking on the lunge, horse becomes progressively more of a lunatic. Constant scoots; EVERYTHING sets him off (this is in an outdoor ring, but one that he is often turned out in), including completely unreasonable noises/movement/I have no idea. Half an hour plus of continued walking, with repeated scoots. The actual reactions become less extreme (good thing) but the frequency increases (not such a good thing).
Eventually, realizing I can’t be here all night, I have a few minutes of relatively relaxed walk, then halt - encourage him to drop his head, very carefully remove feet from stirrups, and quickly jump off (at this point, it’s safety and me getting the hell off him over dismounting slowly so as not to scare him). Again, he has a big spook/jump sideways (although not as exaggerated as the first one) and I land on my butt as I’m attempting to dismount.
Spend another few minutes laying over him and jumping off from there, but have to leave it at that (we’ve now been at this an hour and a half and it’s getting dark).
Sorry for the novel; trying to work through this. I really have no idea what is setting this horse off - I’ve never experienced behavior like this, and it is quite out of character considering how he is on the ground. Any suggestions? At this point, I’m first and foremost concerned with how to prevent the bolting during dismounting.
I rub him all over when he’s mounted (again, this sort of things has been done for weeks). Simply removing my feet from the stirrups and banging my feet/legs around is not a good strategy, since this seemed to set him off, I might not be so lucky next time.
He has a competent handler on the ground every time, and this has not been a deterrent.
I’m considering shipping him to an indoor arena (mine) so he has less to look at, and potentially walls to prevent him from going anywhere. I am less confident in trusting the fence around an outdoor ring to serve as a barrier.
I’m also concerned it is a physical discomfort/developmental issue. This is a lovely horse with good conformation, but I find he appears disjointed from front to back and his back end frequently trips when trotting on the lunge. Perhaps just needs some time to grow and mature before continuing?
Saddle fit has been checked; the saddle we were using when he had the first episode (on Day 2, when I came off) apparently fit him poorly; the saddle that has been used since fits him well.
His owner is also going to have a chiropractor look at him shortly.
Very puzzled by this situation; any suggestions would be appreciated.