W. H. Maxwell, The Field Book: or, Sports and pastimes of the United Kingdom
“ The fetlock, as it is termed, is found in all horses, especially in those of the northern breed, and from its position is an admirable guard against thorns, furze, flints, or other bodies, to which the pastern, without it, is so much exposed. The only excuse for this foolish practice is, that it is customary, and makes a horse look clean about the legs; and this notion is carefully preserved, and impressed upon the minds of those inexperienced in horses, by the men employed to operate on the occasion. ”
