Horse falling down / falling asleep
I've noticed this a few times in the past week. When I got to the barn this morning, my horse was nodding off and almost falling to his knees. He would wake up and catch himself each time and never actually fall, but it was scary to see. For the next few hours, we had a very successful ride, a little dressage, some jumping and a quick canter around the hay fields. He had no signs of lameness and had PLENTY of energy for his ride. After that he spent another 2 hours out on pasture grass with no problems. He came back in for his dinner and now he's doing it again. He did this for a few weeks last year and it disappeared on it's own. It's just a little scary to see. I did find a puffed up tick on him 2 weeks ago, but Lyme disease seems to produce joint stiffness which he obviously does not have from the way he's been training. He also has had hives on him in random different places on his body over the past month. It does not appear to be food related, so I'm thinking maybe he has allergies to airborne things and the allergy is knocking him out? Any ideas?