What else can cause ulcers in a low-risk horse?

Hm.. Maybe it's just genetic or just some kind of imbalance in her digestive tract. Does your vet have any ideas on it? It sounds kind of random. Or an allergy like Always said.

No, they had no idea. They couldn't even tell me what to do besides feeding her a little less grain (she gets 1/2 scoop of oats), putting her on TractGard, and giving her UlcerGard whenever I have to trailer her somewhere.

Did you actually have her scoped to determine she had ulcers?

Yes, I did.

Has she been on any medications?

Did the vet have any ideas?

I did UlcerGard for thirty days. The symptoms disappeared and I didn't have her re-scoped. The vet had no clue why she got them in the first place.

Darn horses. They are always trying to confuse us.

Yeah, this one especially. I'll just add this to her list of unexplained problems... which includes chronic infected blood clots in her jugular veins and chronic dermatitis on her private parts. And of course, nothing normal ever happens to her! No colic, no colds... not even any strained muscles!