This is a long shot but there is so much knowledge on this forum I thought I would give it a try.
5 days ago my horse had a couple of little coughs when eating his mash or trying to chew his peanuts. I wasn’t worried until I tried to work him. On the lunge line when asked to canter he shook his head and threw it up in the air. He did canter but had trouble to maintain it. I went back to trotting and he seemed fine. I put on side reins and he produced a nice round stretchy trot. However when I switched to the right he panicked so I took the side reins off.
I gave him a couple of days off and kept an eye on him. He would occasionally cough a little, again when eating his mash but not when eating hay. He does not have a nasal discharge but I did notice some clear phlegm coming from his mouth.
I tried to lunge him again today. Threw his head up on the left canter but not the right. When trying to “blow” he coughed again. This is not a noisy belly cough but a light throat clearing/ choking type of cough.
At this point I am afraid to ride him as the last time I rode him when he had some neck pain I ended up in the dust. I have made an appointment with the vet but she can’t come until next week. I thought that someone here might have an idea what I am dealing with. My thought is some throat or airway obstruction.