Should humans be pigeon toed or turned out? I believe some have conformation that is best left pigeon toed. Others not. To mess with either is a mistake.
Is it?? One of my kids was really 'pigeon toed' in one foot when a toddler & the doc said that if it stayed that way, seeing a podiatrist & using a brace would be important. Thankfully it straightened itself out.
I agree with loosie that the alignment of the phalanges bones resulting from the angle of P3 is paramount. But I'm not certain what angle with the ground results in this correct alignment.
According to... can't recall sources, no time to look up... actually don't recall if ELPO has facts & figures on this, but betting... most I've seen, seems to be general consensus that for bones to be in alignment, the distal surface angle is within the realm of 3-5 degrees - of course, as we're talking animals, there is no one hard & fast measurement - everyone is individual.
I suspect, and have read the same (somewhere?), that the best angle varies with the horse as does the angle of the human foot mentioned above.
I have become convinced that the live sole plane is the best guide for proper alignment of P3. If the hoof is trimmed so that the live sole is ground parallel, I believe the bony column will be correct,
Yeah, that's what I meant - agree. Generally. as per above comment on individual diffs, it's not infallible, but a good general rule I reckon.