What is the matter with my horse?

ok, something is wro with him, have him vet checked if he fell down it can be bad, my appy yawns and drools alot hes 3. tht just means hes bored. but try reposting this question in the horse section of yahoo anwsers and alot of very nice horse owners, trainers and possibly vets will help you!!!! idk whats wrong with him but i hope i can help by telling you that