Go have the foot he's lame on x-rayed. If your close to UC Davis you have one of teh best equine hospitals in teh country at your disposal. However they aren't cheap. You might also find a vet that works on racehorses. Those horses are worth a lot of money and the owners wouldn't take them to a vet that didn't know about lameness and there isn't any kind of lameness that a vet like that wouldn't have seen. I would either spend the money and get it taken care of right NOW or I'd put the horse down. I wouldn't make him stay lame for any longer.
There's nothing like the Rockies in the springtime... Nothing like the freedom in the air... And there ain't nothing better than draggin calves to the fire and there's nothing like the smell of burning hair. -Brenn Hill