I've seen some farrier to take off the sole (with the hoof knife). I believe some of big name NH farriers do it this way (I have to dig out names though as I can't say from the top of my memory). Personally I'm not persuaded it's a way to go (in particularly because one can take off too much). When my guy does my mares (or even when I do "touch-up") the clean live sole seems to show up without any extra "digging" with the knife.
Another thing, which makes me very uncomfortable is cutting off the frog. I've seen one farrier in my area who does it as "norm". While I do understand cutting off the "flaps", but he was just cutting off the nice solid frog to make it "flat" with the hoof. Does it make any sense? In my understanding (and I'm NOT a farrier) the frog basically is a shock absorber (that is also not solid, so can "flat out" under the weight of the horse). Taking off that extra part will increase the stress/shock on bottom of the hoof. No?
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