Great that it's working so much better with Karim!
is there a chance that you can put a pile of hay into your training area? This might be a solution for the situations when he gets too excited but doesn't take a break. You could simply suggest eating hay for a few minutes, or even just handfeed the hay if he is too excited to eat from a pile.
I want to train to give the hooves in a nice way, because the blacksmith will come soon. He doesn't like it at all, i don't want to hold them or something like this. He stamps with his feet when i ask him to give me his hoof. Do you have any tip for me?
For us, hoof rasping is supposed to be a fun game and the horses are allowed to join in if they want to. However, one of the main features of a game is that you aren't forced to participate and that you (feel that you) can step out of it anytime. Therefore, I have to make sure that we never get into a situation where the horse wants to pull away his hoof and I hold it. That means that I always try to be faster than the horse in suggesting to put the hoof down again. In practice, that means that with a new horse I start by lifting the hoof for about half a second or so, praise him enthusiastically and immediately put the hoof down myself. Next time, I can try to hold it for a whole second already, and so on, until I can trim the entire hoof.
The important part of it is just that I praise and admire the horse during the time when he keeps his hoof up, but I have to anticipate when he will have had enough, and then never let it get that far. In that way, hoof trimming is not a nuisance for the horse for which he feels that once he has agreed, it will be hard for him to get out of it again. Instead, if at all, hoof trimming always ends too early.