27/06/2025
SOLE DEPTH!! I found this very interesting. I know there's a lot of talk and confusion about sole depth. What does it mean to have thin soles? And why is it such an issue?
A healthy horse hoof should have a sole depth of approximately 1/2 to 3/4 inch (12.7 to 19 mm). I want you to have a visual, what does 12.7mm (the MINIMUM) look like?? I'm holding it in my hands! This gave me perspective, and I want you to have it too! What does 9mm look like? 6mm? 4mm? 3mm? Take a look! Next time you have x-rays taken & your vet says, "He has thin soles", ask your vet for markup measurements on the x-ray (they'll know what you mean). The vet can give you the estimated mm depth as well from the xrays. Then take a look here for a nice visual reference of what that actually looks like. Does my horse have adequate sole?? A horse with 12+mm of sole has a good amount of protection. Now think about a horse traveling with anything LESS- All the sensitive structures including the corium and coffin bone are just above that barrier. Ouch. Now, combine that with wet weather and mud, which softens the hoof, and we have issues.
There are a couple things that can be done to help the horse build sole: forage based diet (removing processed feed, and adding minerals), regular exercise, regular trimming cycle, dry & clean environment, removing excess sugars from diet, identifying & treating metabolic issues, using hoof hardeners, treating thrush (removing inflammatory response from the hoof), to name a few. Some horses persist with thin sole regardless of what we try to do to help. This can be due to a number of things including internal hoof damage, coffin bone remodeling (chronic laminitis, founder), reduced blood flow within the hoof, subclinical laminitis episodes, sugar overload, over-trimming the sole, metabolic disease (chushings, PPID, IR) and more. That's when casting, boots, and glue on shoes can be used to support the horse.
** edit to add**** This is sole that popped off a horse in shoes. This is not live sole, it's excess sole that could not naturally exfoliate due to the protection of the shoe. So it was no longer attached to the live sole. (normal process, no harm done). It popped off foward of the apex (tip) of the frog. That's why you can see the V shape where the frog would have been. This is the area that is most susceptible to making thin soled horses "footy" if it thins out. So this is a GREAT visual to sole depth in the area most important for coffin bone protection.