Why would my mare have swellings on her neck? They are at the very top, just before neck meets jaw at the bottom. They are on both sides. They are not causing her distress, not painful to touch and she seems bright as a button. If I poke them they move but come back. I'm looking through my copy of Veterinary Notes for Horse Owners but not really finding anything that matches what she has. She is out of work at moment so I don't know if this is affecting her breathing.
Any ideas?