I have a 29 year old QH that randomly started quidding his hay. His hay is soft and he was just eating it fine. This started about 3 weeks ago which is also when he started to be put on grass..I had the vet come out and check all his teeth none were loose, but she did file a couple sharp edges. We have his teeth floated every year (just done in Nov 2019) . Although thinking back, the vet did not look in his mouth ..she just felt around and went over every tooth. He did not react in any pain to any tooth she messed with. She indicated his front molars are smooth but his back have enough to eat hay. Even though his original hay was pretty soft, I got the really soft 2nd cutting hay that he loves (recently inhaled when he got it)! He is still continuing to quid.. he really wants the hay and eats it half way then spits it out. He is eating grass and hay cubes fine. Any suggestions? Get a equine dentist? request vet to actually look in mouth? what other things could be causing him to quid? Thanks!!