566 BUREAU OF ANIMAL INDUSTRY. 



foot, but indispensable except for horses at slow work on soft ofround. 

 Since a proper surface of support is of the greatest importance in pre- 

 serving the health of the feet and legs, it is necessary to consider the 

 various forms of shoes best adapted to the diflfercnt forms of hoofs. 

 Certain properties are common to all shoes and may be considered 

 first. They are form, width, thickness, length, surfaces, borders, 

 '•fullering," nail holes, and clips. 



Form. — Every shoe should have the form of the hoof for which it 

 is intended, provided the hoof retains its proper shape; but for every 

 hoof that has undergone change of form we must endeavor to give the 

 shoe that form which the hoof originally possessed. Front shoes and 

 hind shoes, rights and lefts, should be distinctl}^ different and easily 

 distinguishable. 



Width. — All shoes should be wider at the toe than at the ends of the 

 branches. The average width should be about double the thickness of 

 the wall at the toe. 



Thichiess. — The thickness should be sufficient to make the shoe last 

 about four weeks and should be uniform except in special cases. 



Length. — ^This will depend upon the obliquity of the hoof viewed in 

 profile. The acute-angled hoof (fig. Scr) has long overhanging heels, 

 and a considerable proportion of the weight borne by the leg falls 

 in the posterior half of the hoof. For such a hoof the branches of the 

 shoe should extend back of the buttresses to a distance nearly double 

 the thickness of the shoe. For a hoof of the regular form (figs. 5J 

 and 8) the branches should project an amount equal to the thickness 

 of the shoe. In a stumpy hoof (fig. 5c') the shoe need not project more 

 than one-eighth of an inch. In all cases the shoe should cover the 

 entire "bearing surface" of the wall. 



Surfaces. — The surface that is turned toward the hoof is known as 

 the "upper," or "hoof surface," of the shoe. That part of the hoof 

 surface which is in actual contact with the horn is called the "bearing 

 surface" of the shoe. The "bearing surface" should be perfectly 

 horizontal from side to side and wide enough to support the full thick- 

 ness of the wall, the white line, and about an eighth of an inch of 

 the margin of the sole. The bearing surface should also be perfectly 

 flat, except that it may be turned up at the toe ("rolling-motion" 

 shoe, fig. 5 a, h, c). The surface between the bearing surface and the 

 inner edge of the shoe is often beaten down or concaved to prevent 

 pressure too far inward upon the sole. This "concaving," or "seat- 

 ing," should be deeper or shallower as the horny sole is less or more 

 concave. As a rule strongly "cupped" soles require no concaving 

 (hind hoofs, narrow fore hoofs). 



Borders. — The entire outer border should be beveled under the 

 foot. Such a shoe is not so readily loosened, nor is it so apt to lead to 

 interfering. 



