Here's a horse training tip that will teach you how to naturally cure a buddy sour horse. This seems to be a common problem among horses and this horse training exercise will show you how to nip it in the bud.
Horse Training: No-Go Mounting. Tips to keep your horse standing still while you get on.
There are so many tricks you can teach your horse. There are all the usual ones like kiss, hug, bow etc, but also have a think about teaching your horse some USEFUL tricks. These can make life a lot easier (and safer) around your horse.