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This is NOT MINE. I took it from another forum. The poster is a very knowledgable farrier from Europe.

Well respected in his field.

How does the frog effect the Blood flow ???
Something I have never understood and nailing a shoe behind the widest part of the foot.


I'm not sure what your business is, but allow me to explain a couple of things. First note that the dome shaped coffin bone gets a lot of support from what in english is called the digital cushion. The ground, through the frog and sole end up supporting the coffin bone. This is a good thing because it reduces the forces acting upon the lamillea that hold the coffin bone in the hoofcapsule in it's place.

Second, you may have noticed that the sole is not level. It is cupped, dome shaped if you will. Upon closer examination you will find that the sole -following the position of the sole papillea- is one solid plate with a triangular shaped slit at the back. That slit is, not surprisingly exactly as big as the frog.

Now think back to that coffin bone and the digital cushion ánd the attachment of the coffin bone to the hoofwall. Now how will the support for the coffin bone thus reduction of tearing forces acting upon the lamillea be maximised? Exactly, when the sole's cupped shape acts as a spring. How? Because of that peculiar shape allowing the frog to absorb the change in shape the sole goes through when the down force of the coffin bone reduces the "cuppedness" of the sole, levels it so to speak or "flattens" it.

Now, how will the "spring action" of the sole be maximised? When the heels of the foot do not move. Any abaxial (away from the center) movement of the heels effectively reduces the spring like force the sole can apply to the coffin bone. Abaxial movement of the heels in fact allows the frog to prolapse. In several cases with prolapsed frogs I have had satisfying results clipping and nailing behind the widest part of the foot. Effectively blocking expansion of the foot. Of course this is not a problem, in fact that expansion you are looking at only serves to reduce the effect of the really important "pump action" in a foot. That of the sole being levelled with the frog compressed, squeezed if you like that better, when the foot is loaded and returning to its cupped shape when unloaded. Thát is important, that is the pump action that helps stimulate perfusion (bloodflow). The abaxial movement of the heels only serve to reduce that.

Why until now so many people still believe that funny movement of the heels strong enough to grind holes in steel shoes is important is beyond me. It should be stored away for good next to those books and articles that claim a healthy foot has a 45 degree dorsal hoofwall angle with the horizontal. (Do you have any idea how often that is still pushed forward as a "fact"?)

So? You still want to maintain nailing (or clipping for that matter) behind the widest part of the foot is something only someone that has "no clue what they are doing" would do? Or are you ready to understand perhaps the mechanics behind horse shoeing are a tad more difficult than you expected when you were ready to explain how well you yourself understand all this? Don't worry I myself had my years where I was convinced I understood everything there is to know about horseshoeing. The difference is I kept silent about just long enough to find out I was wrong.

This is a public bulletin board. It is carried by horse shoers and read by horse owners. When you feel the need to critise work by a colleague based on what an owner tells you without having seen the work or even knowing the shoer, you better first start thinking about your own capacities first.

Tradition and respect brought us where we are.

 
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