Frush, or Running-Thrush, in farriery, is a discharge of fetid, and sometimes ichorous matter, from the cleft in the middle of an horse's foot. It attests one, two, and sometimes all the animal's legs ; but more frequently appears in the fore-feet. It is occasioned by narrow, concave, or hollow shoes ; which, pressing against the fleshy part of the frog, cause pain, inflammation, obstruction of the blood, etc. - There are few cases in which the frush admits of a radical cure ; because it is subject to frequent returns, producing at length lameness, in consequence of exposing the raw and tender parts to the action of sand, grave, hard ground, etc.
But, if the disease proceed from contracted, narrow heels, in those feet which are said to be hoof-bound, it cannot be cured, without removing the first cause; though even in that case it will only admit of palliation. In wide hoofs, however, that are open at the heels, and where the complaint is recent, or is sus-pected to arise from concaveshoes or from keeping the hoofs too hot, dry, and hard, the cure may be effected with ease and safety, by laving aside those shoes; washing the frogs clean after exercise, and dressing them with Mel AEgyptia-cum, prepared in the following manner : Take 2 oz. of verdigrease finely pulverized ; 6 oz. of honey, and 4 oz. of vinegar: let the whole be boiled over a gentle fire, till it acquires a reddish colour. Or, 2 oz. of blue vitriol, dissolved in a quart of water, may be substituted for the preceding composition, if the hoofs be kept cool and moist. At the same time, it will be requisite to have recourse to bleeding, and purging-medicines, which may be repeated two or three times at proper intervals; or, to diuretics, which are preferable, as they may be continued for some time, without confining the horse to the stable.