Frog on the Ground
Bowker's research has shown that the frog must be on the ground. He emphasizes that in order to get the frog resting on the ground, the farrier must gradually lower the heel. When the heel is not on the ground, the foot will start to contract and get smaller, similar to a woman wearing "high heeled" shoes.
According to Bowker, "Once the frog is on the ground, the bars will contribute in supporting weight and much of the load will be supported by the sole."
This load is transmitted to the sole around the frog apex via the dirt that accumulates from the ground. "Dirt should be left in the foot," explains Bowker. In other words, don't clean your horse's feet unless they have been standing in a lot of manure.
Bowker further states that a foot that has a high-cupped or dished-out sole and frog that is not on the ground will not be able to support its weight with the frog and solar surface. This goes back to the analogy mentioned earlier about high heels and a small surface area for weight bearing. This small surface area results in high loads being placed upon the foot and will result in significant stress changes to the foot tissues.
"In a nutshell, what we want when the farrier is finished trimming the equine foot is that when viewing the solar surface of the foot, one-third of the foot will be in front of the apex of the frog, and two-thirds behind it. This creates a short toe and encourages a 'heel first' landing."
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