If your farrier shoes your horse with quite a lot of support for the heels, I’m sure you’ll know the annoyance of the horse pulling the shoes off in the field, especially infuriating if it’s the day before a competition!
As advised by my farrier: huge rubber overreach boots are the answer, perhaps even two pairs initially, one of XXL if you can get them, and then a normal pair on top to keep the huge ones in place. After a while you can usually get it down to just one XL pair, as seen in the photo. The huge ones might get a bit shredded here and there but the important thing is that the horse treads on the boot first, rather than the shoe.
I’m not sure whether they learn from this or not, but things definitely improve over time, and it saves a fortune in calling out the farrier to stick a shoe back on, hours walking around the field looking for the missing shoe (and the flipping things can travel a long way through the air!) and the effort of removing a twisted shoe which is still on the horse. Wish I’d thought of it years ago!