Texarkana makes a SUPER valid point.
A tough horse is a tough horse.
A horse of one of my clients, horse was well known for objecting to every little ache and pain in a very dramatic fashion, had a minor gas colic and decided he was dying. I looked at the BO, my WS and BM and said if (my horse) ever acts like this, call the vet, hook the trailer up and get drugs on board before even calling me. Tough horse wasn’t close to track sound when he retired after 7 years on the track, multiple stakes winner-Two years of rehab and he took to his new life to a duck to water. Never complained once, always looking to work.
I personally look for a tough horse, and love a good horse that is still track sound after many starts over many seasons-not much Dr Green and common sense can’t fix with a horse like that. I think I just found another good one, retired racing sound after 9 years. He’s walking around the arena bareback at the moment, looking to work more.
Also, a slow horse IS sometimes just slow-and the usually have zero work ethic.