She has Impressive in her bloodlines, but VERY far back.
At first I thought tying-up syndrome, but I hadn't worked her or anything. That's why I'm wondering if its not early signs of HYPP?
She's also been lame lately. I had her feet done yesterday, since she was due I didn't know if that was her problem or not. There is no heat in her legs, and she doesn't have an abscess (sp?). I know her being lame PROBABLY has nothing to do with her back legs trembling, but I thought I'd mention it.
As I stated before I had her feet done yesterday along with my other three horses so I'm going to have to wait a paycheck or two until I can get the vet out to have her tested. Running a pretty tight budget lately.
What else could it be?