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Chronic disorder involving the tarsus (i.e., hock) of the horse.
See also: bog spavin, bone spavin, blood spavin.
Synonym(s): jack spavin, jack


1. male donkey; called a stallion in Great Britain.
2. see track leg.

jack colt
male donkey less than 3 years of age.
mule jack
one bred to mares for the production of mules.
References in periodicals archive ?
We were in the park the other day and we met Pat Kenny walking his Wiemaraner and Pat's dog was bossing Jack around because he is such a wimp.
Luckily, no sooner had I realised what was racing towards us when I heard Richard, over my right shoulder, call to me to turn right and guide Jack around the fence.
It creates dis urge (which he says as 'oi-ge') in people to clap along, or tap their foot or get up and jack around it.
The in the first half stoppage time Vale keeper Mark Goodlad got down well to push an effort from Rodney Jack around the post.