I've added mark-ups to Jasper's album here:
The general overview is that the feet are overgrown in many dimensions. Just because Jasper is a big boy doesn't mean that the feet should be allowed to to become long, flared and pancake-soled so that they fit some sort of internal picture we have of what a large horse's feet "should" look like. They need to be kept true to their genetic blueprint, which will tightly align them to the structures within so they can correctly support his mass. Right now, the toes are much too long horizontally, heels are severely under run and leaning outward, soles are thin and lack concavity, frogs have been stretched forward. The RF has a more upright configuration while the LF has been allowed to become flatter and longer - a situation termed high-low. These are all trim issues. Goals are to bring the toes back in the horizontal plane, move the heels back under him where they belong, remove the flaring all around.
LF lateral: White-out are is an idea of how the toes need to backed up to get rid of the excess toe length. Do not then thin the entire dorsal wall to make it blend visually into the backed toe - just address the lower third at each subsequent trim until it grows out.
RF dorsal: Lime lines are where the hoof capsule should be. Outside of these lines are the flares. The medial wall appears to be flaring more significantly than the lateral - which likely means it is also taller than the lateral wall. Need to bring these in hard, from the top, then bevel under so the disconnected material is relieved from ground contact to allow it to regrow well attached. Beveling will redirect shearing forces away from the compromised connections to allow them to regrow solidly attached.
RF lateral: This also has the LF medial in it. The light blue lines follow the coronary band - note the arched shape. It should be even, with no bulges upward. The arched areas indicate areas of the hoof capsule that are taller than the adjacent areas. Follow the tubules down from their start at the coronary band to the ground to find which areas need to be adjusted. Yellow lines follow some of the tubules from start to ground - note how run forward they are, more severely as you move from front to back. Also worse on the LF than the RF. Purple line follows one growth ring around the hoof capsule - note how uneven it is. Those waves indicate where the hoof is uneven is length at ground level, with the higher areas being longer than the dipped areas.
LF lateral: Blue line follows the arch of the coronary band. Yellow lines follow more horn tubules. Note the disparity between the front one and the ones further back. Pink line follows the dorsal wall, which has a slight bull-nosed configuration. It means the dorsal wall is being rasped flatter to make it appear straight from top to bottom. Unfortunately, this is disguising the fact that the toe is much too long horizontally. Purple line is where the last horn tubules at the heel should be located. Red line starts where they actually are and spans the distance where they "aren't" because they have run forward and have been squashed under.
RF sole: Green is where the healthy hoof capsule should be. Everything outside this line is flared, stretched walls that need to be brought inward. Toe backed up between 10 and 2, then walls brought inward. This should be done from the top so as NOT to remove any sole. Purple are the current heel buttresses, blue is where they should be, even with the widest part of the frog and with each other. Moving them rearward will take time as right now the rear half of the foot is lower than it should be with respect to the front half, leading to a likely ground parallel coffin bone situation. With the soles likely being thin, there is no way to make major changes to their location except in small increments done frequently. This means running the rasp once over the area directly behind the current location of the heel buttresses to flatten it and extend the heel buttresses rearward but preserve the already-compromised vertical height as much as possible.
Red is about where the true tip of the frog is - approximately 1" ahead of where the bars terminate in the collateral grooves. It doesn't need to be removed at this time, just need to be aware that it is being stretched forward as the entire hoof capsule is sliding forward. Yellow areas are the bars that are leaning outward, pooling over the sole and pressuring the walls at the heels and quarters to flare to the outside. Need to start taming them back into a more upright configuration but DO NOT amputate them as they are serving an extremely important structural function due to the loss of support from the rest of foot. Need to work on them from the outside working back in toward the frog over time.
LH dorsal: Blue lines show the significant flares, esp. the lateral wall in the heel area. You can probably feel an abrupt change in the angle if you place your hand on the hoof wall and slide it gently from front to back. The area where that flare abruptly starts is under quite a bit of stress and if not relieved, could result in a quarter crack over time.
LH lateral: Purple line follows the curving coronary band angle. Blue line highlights the bull-nosed appearance of the dorsal wall. This is a red-flag for the toes being both too long horizontally AND higher than the heels = a ground parallel or negative plane coffin bone. Yellow lines again highlight the run forward and flattened angle of the tubules in the heels.
LH sole: Same as RF sole with the added issue of the bulging flare in the lateral wall. Green arrows emphasize the areas that are all too far out from the healthy hoof template. Need to bring all of those ares inward/back, from the top and bevel under to help deflect the concussive forces away from the damaged laminar connections.
The trim schedule will need to be short - no more than 2 weeks between adjustment initially - or you won't be able to maintain any changes made. Once toes get ahead and heels run under, it becomes like an out-of-control freight train, with the toes being the engine that hauls the rest of the foot ahead at an astonishingly fast pace. To stop the train, you need to apply the brakes often.
Jan 05, RI
EC Support Team