Spavin

[H]is horſe hip'd vvith an olde mothy ſaddle, and ſtirrops of no kindred: beſides poſſeſt vvith the glanders, and like to moſe in the chine, troubled vvith the Lampaſſe, infected vvith the faſhions, full of VVindegalls, ſped vvith Spauins, raied vvith the Yellovvs, […]

Source: wiktionary

Of ſpauens, there be tvvo kindes, the bone Spauen and the blood: for the bone Spauen, you ſhall dreſſe it in all things like the ſplent, and it vvil heale it. For the bloud ſpauen you ſhall take vp the veane, and vvhen it hath bled vve pull out the bladder vvhich holdes the ſpauen, and ſtop the vvound vvith Sage and ſalt, and it vvill heale it.

Source: wiktionary

Doubtleſſe a Spauen is an euil ſorance, and cauſeth a horſe to haule principally in the beginning of his griefe, it appeareth on the hinder Legges vvithin, and againſt the ioynt, and it vvill bee a little ſvvolne, and ſome horſes haue a thorough Spauen, vvhich appeareth both vvithin and vvithout. Of the Spauen there are tvvo kindes, the one hard the other ſoft: That is: bone-Spauen, and a blood-Spauen, […] Caſt the horſe and vvith a hot yron ſlitte the fleſh that couereth the Spauen, and then lay vpon the Spauen, Cantharides and Euforbium boyled together in oile de Bay, […]

Source: wiktionary

Mr. Field had seen the same horses brought to his forge from day to day, and year to year, with large spavins, yet continuing perfectly sound.

Source: wiktionary