Every time a horse comes off the track, I pull their shoes. Most of the Thoroughbreds that I have encountered off the track have extremely long toes, and no heel. It's not always the case, but most of the time, when we pull shoes, we take a lot of excess hoof with it.
Our program at THR is simple. We initially have a farrier come and pull the shoes and trim the feet. They know how much hoof they can safely take off and get the horse going in the right direction. Then, we just let the hoof do its thing. We trim off any jagged edges every couple of weeks while allowing the heels to spread, and the hoof to grow like it was meant to.
Every few months, or if the horse is in serious training, we have the farrier revisit the horse to make sure the hoof is growing like it should and it doesn't need a "tune up." We are also fortunate enough to have great pastures and a wonderful irrigated grass field to ride on, so their hooves really don't get broken up much.
Where we are located, it costs $50 per horse to trim. Now, $50 is reasonable if you have 1 or 2 horses, but if you have a farrier trim 8 horses, then we are talking about $400 every 6 weeks or so. That would be $3,500/year in farrier fees for THR. That is something we can't justify doing at this point in time.
The solution? I personally trim every horse at the rescue. The horses know me, I groom them, I bathe them, I ride them. They trust me, and they are always great about standing for me. I am no expert, but having a quality rasp, stand, and farrier apron is key.
Here is the before and after of Benny's hooves that I did today. It took me about 10 minutes total, and it really improved the overall shape of his hooves.