We had a big, sweet, super babysitter DELIGHT of a draft cross school horse, Kirby, that would buck every time you used the whip. Not super hard, but it was like a correction to the correction.
He was such a champ that it didn’t matter, but he just wasn’t having it. Wasn’t going to do a lengthen either. You could take your lengthen and your dressage whip and put them in the same place thankyouverymuch. But he would pack a tiny child around and never drop them, and he would jump around 3’6”, so it’s not a hill I was interested in dying on.
I have a hard time ignoring unwanted behavior too, because I spent way too much time believing old wives’ tales that had me convinced that if I didn’t punish “bad” behavior I’d create a monster.
However, what I’ve found is that if I can ignore the unwanted behaviors and just continue to reward what I want, then the unwanted behaviors go away (or I never create them) because my horses know what they need to do to earn the rewards.
If a horse knows what he needs to do and isn’t somehow blocked from doing it, it takes very little pressure, of any kind, to motivate him to cooperate.
This. You need to desensitize them to the whip. Then it can go back to meaning something. 10 taps in a row, or as many as it takes to get NO reaction. I have to do this with my mare all the time. Also, she is reactive to the leg, so we work on flopping the leg around or moving it into canter position (without cuing the canter) to build patience and tolerance. It works, but takes time. She’s become so much better, but we still sometimes have to have a remedial whip or leg day.