Vet can't be out for a couple days, but I have a mare in foal (due in april) that is out on pasture went to check on her and she is acting really uncordinated (sp) and wobbly. She is having trouble placing her feet and and is tripping a little bit. Other than that she looks great, clean nose, bright eyes, alert, eating, drinking...I am really worried...what could this be?? I don't believe it's founder, just not the right symptoms and her pasture isn't real lush. Any thoughts?