CHEST-FOUNDERING
,—a debility in the shoulders, chest and fore-quarters of a horse, seemingly less understood, and certainly less explained hitherto, than any one disorder or defect to which the horse is incident. Those who have written upon this subject, evidently echo each other; as they literally and individually say, "it proceeds from hard labour, whereby the horse becomes surfeited; so that, upon the whole, it is no more than a severe cold, and is to be managed accordingly." These are, in fact, the very words of Bracken, who precedes it with this remark: "Most authors agree it is so;" giving no opinion of his own, beyond its originating in a "severe cold," and is to be "managed accordingly." He says, "the signs are a staring coat, and heaving of the flanks more than common." That a chest-foundered horse may happen to have a staring coat, or a heaving of the flanks, from some different or remote cause, cannot be denied; but that either of them are diagnostic symptoms of chest-founder, no scientific practitioner will ever admit.
A horse said to be chest-foundered, is almost invariably contracted in the breast between the points of the shoulders; becoming narrower there, as if there was a wasting of those particular parts. If you put him into a trot, he moves his legs one before the other with great difficulty, as if they were internally connected, and prevented farther extension by two latent links of a chain. When pressed to a gallop, the case becomes instantly decisive; he labours to get his legs from under him without success; a general constriction pervades the whole of his fore parts; and his action may, with much more propriety, be termed jumping than galloping.
Although no one author has given a proof he ever bestowed an explanatory thought, or condescended to transmit a single line, upon the absolute cause of this very common defect, yet it by no means seems sufficiently involved in ambiguity, to render fair conjecture, or professional opinion, a matter of the least difficulty. As the disorder is invariably fixed upon those subjects who have done the most expeditious and constant work, without having been ever known to affect those who have done little or none; so it is natural to conclude, the intercostal and subclavian muscles must have sustained injury, from the incessant vibrative concussions occasioned by the almost eternal contraction and expansion of those parts, in such labour as horses are put to who become subject to the misfortune, which partakes much more of oppressed nature than of disease. It should seem, by the great number of horses (decidedly chest-foundered) who experience evident relief, and go with much less pain and difficulty, when they have got warm, that the muscular parts acquire rigidity when in a state of inaction, but expand, and gradually throw off the stricture, so soon as the circulation is encreased by action, and perspiration produced; both which subsiding, the previous stiffness returns. Let, however, what will be the cause, (and upon which the best opinions may vary,) instances are very rarely or ever known of perfect cure, or complete eradication. Long rest, by either a summer or winter's run, will always be found productive of relief, and sometimes hold forth a descriptive promise of permanence, which very mild and gentle work may continue; but hard riding, long journies, or severe labour, will always produce a relapse.