AN ILLUSTRATION OF THE ABUNDANCE OF WHITE POWDER INVESTING DECAYED HORN, AND OFTEN FOUND AFTER THE RAGGED PORTIONS OF A THRUSHY FROG HAVE BEEN REMOVED.
The knife must then be used fearlessly. Every particle of the colorless investment of the frog must be excised. This is absolutely necessary toward the cure. It must be accomplished, although the flesh be exposed, or a large, bulging frog be reduced to the dimensions indicated in the annexed engraving.
Then the shoe is to be nailed on, and the horse to be returned to a clean stall.
The cause being removed, the effect will soon cease. No ointments are required. A little of the chloride of zinc lotion, three grains to the ounce of water, may be left in the stable, and the keeper should receive directions to bathe the frog with this once a day, or oftener if required. A piece of stick, having a little tow wrapped round one end, should also be given to the man, so that he may force the fluid between the cleft of the frog. No greasy dressing need be employed. The ordinary shoe is to be used. The diseased part is to be left perfectly uncovered, so that it may be the more exposed to the sweetening effects of pure air, while the earliest indication of any further necessity for the knife may be readily perceived. When the stench has disappeared, a little of the liquor of lead, of its original strength, will perfect the cure; and all that is requisite to prevent a return of the disorder is a reasonable attention to the cleanliness of the stable.
At this place, however, the reader may well reflect that, if the filth of the stable is capable of rotting the resistant and insensitive horn of the horse's foot, how much more is it likely to affect some of those delicate structures of which the bulky frame of the animal is composed! The air in which a man might object to live is altogether unfit for a horse to inhale. It is true, animals have breathed such an atmosphere, and continued to exist. So, also, is it true that men have been scavengers, and have followed that calling on account of what they esteemed its extraordinary healthfulness. Neither case establishes aught. The animal is by nature formed for large draughts of pure air. All other sustenance is as nothing, if the primary necessity of life be withheld. Tainted atmosphere is the source of more than half the evils horse-flesh is exposed to. Glanders, farcy, inflammation of the air-passages, indigestion, bowel complaints,—in fact, all diseases save those of a local character may spring from such a parent. Let every horse-keeper, therefore, if from no higher motive, at all events to conserve his property and to promote his pecuniary interest, be especially careful about the purity of his stables.
When thrush occurs in the fore feet, it is generally significant of navicular disease, and is most frequent in horses which step short or go groggily. The hoof feels hot and hard; a slight moisture bedews the central parting of the very much diminished frog. No odor may be smelt when the foot is taken up; but by inserting a piece of tow into the cleft of the frog, the presence of the characteristic symptom will be made unpleasantly apparent.
In this case, it is best to remove the ragged thrush and unsound horn, doing so, if required, even to the exposure of the sensitive frog. Afterward, simply wash the part with a little of the chloride of zinc and water, previously recommended. Repeat the cleansing every morning; the intention being, not to remove the thrush, as the horse mostly goes lame the instant that is stopped, but merely to correct the pungency of the morbid discharge, and thus prevent it in some measure from decaying the horn.
Clay, cow-dung, and other favorite filths, employed for stopping the horse's feet, if long continued, will produce thrush.