My friend (we'll call her "Cindy) brought her favorite horse into the stable and got him all ready to be ridden...she hadn't ridden him in 2-3 weeks due to he got a sore on his withers and someone riding bothered it. So, she dried him off (it was raining), and let him sit in the stall for a while, while she rode another horse. When it was his turn (he's a 17 year old Paint gelding named Murphy...makes it easier to call him by name instead of "him" haha) she tacked him up, and asked who was the last one that rode him, how he behaved, etc.
I told her that a young girl (probably 14 year of age) rode Murphy yesterday...walk, trot, canter, and jumping. He behaved fine...he seemed to have energy, but listened fine. So Cindy asked if she lunged Murphy before she got on him...I said that I did not know if she did or not, but usually he doesn't get lunged.
So Cindy put Murphy's bridle on and brought him into the arena. She had a hard time getting him to stand while she mounted...but that was always his one problem, so she thought nothing of it. So she walked him around and warmed him up...and once he was warmed up she asked for a trot, and trotted him around...doing some bending and circles. Once Murphy seemed to be responding good and listening, she trotted around the whole arena once...and then asked for a canter.
The SECOND she asked for the canter Murphy went into a HUGE bucking fit. I have NEVER seen a horse buck that hard...he seemed determined to get Cindy off. Well, of course, he did get Cindy off and poor Cindy got thrown into a jumping pole (ouch).
Once she said there was nothing broken, and walked out of the arena...I put Sonny back in his stall...untacked Murphy and lunged Murphy around, letting him know he can't get away with bucking.
I lunged him for a good 10 minutes...I was just standing in one place hitting the lunge whip (with a bag at the end) on the floor to get him to go...occasionally walking towards him if he'd stop and wouldn't go). Once he seemed tired enough, I dropped the bag whip and asked him to stop. He stopped fine and I approached him to check to see how tired he was and if he was sweating.
The minute I came close he started quivering...almost like he was a seriously abused horse that trusted no humans. He flinched when I touched his chest to see if he was sweating.
When I brought him back into his stall he kept fighting for his head (I was holding on to his halter and leading him). He trotted into his stall and went to the very back of it and just stared at me.
He was shaking the whole time I put on his flymask and wouldn't lead very well when I was leading him out to the pasture.
Any ideas on why he bucked?
Here's what I know:
1) It was NOT due to pain...his ears were up when he was bucking, and he was showing no signs of soreness.
2) his withers have been completely healed for a good week now...he was cantered yesterday by a young girl and he acted fine.
3) he didn't spook because absolutely nothing scares him
4) he did not trip (I was watching and he didn't)
There's a picture of Murphy and my friend that was taken today before he started bucking