When uniform setting down of the hoof and uniform wear of the shoe are desired, every point in the coronary band in the posterior half of the foot must receive support by the shoe. This applies particularly to the outer halves of hoofs that are extremely base-narrow. If, for example, the coronet of the outer quarter projects beyond the plantar border of the quarter, the outer branch of the shoe from the last nail-hole back must be kept so wide (full) that an imaginary perpendicular line dropped from the coronary band will just touch the outer border of the shoe. The inner branch, on the contrary, should follow the edge of the wall as closely as possible. Furthermore, the new shoe should be given more curve,—that is, made wider and fitted more full where the old shoe shows greatest wear. The principal thought should be to set the shoe, which should always be regarded as the base of support of the hoof, farther towards the more strongly worn side. Such a practice renders superfluous the wide-spread and popular custom of bending outward the outer quarter and heel-calk of hind shoes. From the manner in which a horse travels and the wear of the old shoe, we estimate the distance that the branches of the shoe should be set from the middle line of the hoof. If in following out this plan the bearing-surface of the outer quarter of the wall is not completely covered, the quarter will be pinched and squeezed inward; this should be prevented by a broader branch punched so deeply that the holes will fall upon the white line ([Fig. 129]).
When the shoer has satisfied himself that the shoe fulfils every requirement and fits perfectly, it is to be cooled, the holes opened with an oiled pritchel, and the shoe brightened with a file. In filing, all sharp edges should be removed. If a shoe is to be filed upon the outer border, to give it a neater appearance, the filing should be done lengthways of the shoe, and not crossways; of course, the shoe must not be bent by being improperly clamped in the vise.
It indicates much greater skill in making and fitting shoes when they look clean and finished with little or no filing.
In the preceding remarks I have insisted upon a horizontal bearing-surface for all shoes, with the single exception of shoes provided with the rolled toe (rolling motion). As far as I can judge from the literature of shoeing, and from what I have seen with my own eyes in many countries, this is the most wide-spread practice. In Germany, on the other hand, there is another method, followed in the military shoeing shops, which consists in placing the bearing-surface of the shoe as nearly as possible at right angles to the slant of the wall. According to this method the bearing-surface of the shoe, depending upon the direction of the wall (viewed from in front, from behind, and from the side), should incline more or less, now backward, now inward, now horizontal, and now outward. Shoes for wide hoofs are given a bearing-surface which inclines inward, while for narrow hoofs the shoes have a horizontal bearing-surface. Shoes for wry hoofs have a bearing-surface which inclines downward and inward for the slanting wall, and for the steeper wall a horizontal bearing-surface, which towards the end of the branch may incline slightly downward and outward. Besides, the bearing-surface of the ends of the branches, viewed from the side, has a backward and downward inclination. This method is practicable only in part.
I. Nailing the Shoe.
This is that act of horseshoeing by which the shoe is fastened to the hoof by special nails called hoof-nails or horseshoe-nails, which are driven through the shoe and horny wall.
At present there are hand-made and machine-made horseshoe-nails. Both kinds should be made of the best wrought iron. The nails must be slender, wedge-shaped, and twice as wide as they are thick. Thickness and length must be in proper relation to each other. We should never choose a nail which is longer than is absolutely necessary to hold the shoe; six to eight sizes are sufficient for all purposes.
The rough nails (hand-made), before being used, must undergo a special shaping to prepare them to pass through the wall easily and in the desired direction. This preparation is called shaping and bevelling. In doing this we should see to it that the nails are made smooth, and even, but are not hammered harder than is absolutely necessary, because the lighter one can hammer the nails the better they will be.
Fig. 130.