I'm assuming you are a younger member because of the abbreviations an large font. It's okay though. Just next time remember us old folks have issues reading it! Lol
Anyway, if he's losing weight, id suggest having his teeth looked at. Older horses sometimes need a dentist more than the young ones, just like with people. Lol ask your grandpa about that. It shouldnt cost much, I only pay $35.
As long as he isnt showing extreme symptoms, running him once wouldn't hurt him a bit! But I don't suggest doing everytime you ride until you figure out what mat be wrong, if anything.
If he is sick, he needs your love and attention. Don't let him see that you are upset. Horses can sense those kinds of things and feed off of your emotions. But for now, don't worry. I'm sure all is fine. Chin up Posted via Mobile Device