So I went out to let me mare out after feeding her and she hadn't eaten at all. She ate a little as I took the feed away but was drooling and acting weird. Then she walked off and laid down. She's 30 but none of these are normal things for her. I got her back up pretty easily and then she was standing super weird and strung out with her head drooping.
Then the noises started. Very loud gurgling noises coming from her neck with her swallowing frantically. The on call vet (as well as the BO down the street and my BF) were called at this point. She started stretching weird and then her neck started spasming. I really thought we were done for at that point and she kept wanting to go down. I kept her moving but she was sooo uncomfortable and she's such a stoic old mare.
I got some banamine in her and she started to get much more relaxed. By the time everyone else had arrived she was much more comfortable and the gurgling had stopped. The vet tubed her and put some water down into her stomach. We found a small (marble sized) impaction that we thought was part of the problem. The vet says she'll be fine. I turned her out into the pasture with no hay or grain (only the grass) and she was happy as a clam!
So unbelievable terrifying. I've never dealt with a choking horse and it was so scary. The vet said in most cases they pass it eventually without help but sometimes, especially if it takes a long time to resolve, it can result in strictures that increase the likelihood of it happening again.
Just needed to share my crummy experience in hopes that it will help other people in the future.... so glad she's alright. She may be 30 but I'm not ready for THAT yet.