I would definitely check with a Veterinarian and a certified equine dentist! I had a pony who was in his twenties and he would choke on his hay. We got his teeth done but he would still choke. We then took him to another dentist who said his teeth were so old that (the ones he had left) were rounded off, like marbles. This made it nearly impossible for him to do anything more than mash up the hay a little which he then would either spit out in wods or he would choke on. We ended up feeding him soaked cubes which solved our problem.