I mentioned this in the runny eye thread, but I want to start a new topic. My new horse saw the dentist in November. She said he is 5, and beginning to have canines erupt. Several weeks ago he began to have chewed grass lodged one both sides of his mouth and in upper and lower lips, in front of the teeth. His front teeth were packed with chewed green icky grass. Every day I clean out the quids, his lips, and brush the gunk off his teeth. (I was afraid that tooth gunk would cause plaque buildup.) Dentist said the quid has nothing to do with erupting teeth. She said half of the horses she sees in the winter are holding chewed hay like that. The gunk on their teeth is like clay. She thinks these horses are not drinking enough water and suggested I add electrolytes. I top dress his feed with salt and his water is heated. I am thinking that the wet grass in the pasture satisfies his thirst, so he doesn't drink as much. We have had a lot of rain lately and there is plenty of green winter grass in sheltered areas of the pasture. He does not eat hay (unless the weather is so inclement that he decides to stay under the shelter where I keep a hay bag.) Since this horse is new to me, I have no idea of his history through various seasons. Does anyone else's horse do this in the winter?