A misterious yearly swelling and Sedating A Pregnant Mare?

[PegasusFarmsAppaloosas]

I’m going to be having my horse’s teeth floated soon and get Lance’s shots done and last year my vet had made the comment that she doesn’t like to sedate preg. Mares unless she has to. At the time I didn’t think anything of it because she doesn’t need to be floated anyways. She said she won’t float their teeth without them sedated because she uses a full mouth spectral thing and if they fight it they can break their lower jaw and she doesn’t want to take that chance. Anyways, my mare should have her teeth checked or at least have the vet look around in there because last year about this time she swelled up like a balloon under her jaw and throatlatch area and I couldn’t get the vet out to look at her till the swelling had almost gone away. (small town, not too many vets and my normal vet was out with a appendicitis and his partner was out with a broken arm or something I ended up going through the phone book asking one by one if they did horses and do they come out to Pa) Anyways, she said that since there was no pain, no difficulty chewing, swallowing, or breathing, what ever had caused it was under control and to watch her. She took blood that didn’t reveal anything and looked in her mouth the best she could with holding the tong (my mare doesn’t care for vets mind you) she said to keep her posted and if we HAD to we could sedate her and see if there’s something going on in there but she didn’t like to sedate preg. Mares.

So, here we are about the same time of year again, and my mare has started to swell up again, this time up more the ears. The swelling had never gone completely away under her chin, but it was such a VAST improvement I just figured it was just going to be like that since it never went up again and like I said the vet’s blood work revealed nothing. Again, there’s no pain, no trouble breathing, no trouble eating, and she uses her ears just fine. It’s been a year, almost to the month and this time it started slow. I put her on Aspirin to see if it would go down (that’s what started it going down last year. . . I think, because after I gave her a butte at 4 am it started going down) I’m going to have the vet out but Buzzy’s rebred and I’m not sure if the vet will want to sedate her or not. Has anyone had this happen before I've had her for about 6 years and only the last 2 years has she had a problem. Could it have something to do with her being pregnant And has anyone had any problems sedating a preg. Mare Is she just being overly conservative or can something really happen to the foal She was bred late may for a late April early March baby if that makes a difference.