I've never seen a horse breathe so fast in my life, not even ones that have just ran a race. And now that I think about it, I rode him a couple times for her just at the barn to give him some exercise and on any normal day that my horse would sweat up a storm, her horse never really did sweat much at all.
Also, he is a 17 year old TB and weighs around 1250lbs (overweight, clearly lol)
Also, we thought about dehydration, but he did pee on the trailer on the way to the show and didn't seem to want to drink a lot.
In the last two years he has gone from being a hard keeper to getting fat off of air. She didn't seemed to worried about him, but I'm curious to know what might be going on with him. A metabolic disorder perhaps?