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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 ?
His best Racing Post Rating over hurdles came over today's course and distance in January, when he finished second to stablemate Good Thyne Jack off an official mark of 85, earning an RPR of 103.
After a live early hours TV interview on the Comic Relief show and a celebration party, pretty Jane, 37, whisked Jack off to a London hotel to show just how much she missed him.
What has happened here is that the loud voices of 300-400 people have 'seen' Sir Jack off for the moment.
Meg, 38, currently filming the thriller Proof of Life at Pinewood Studios near London, tearfully waved Jack off at Heathrow Airport.
Petford, however, was to be the bridesmaid again when, after leading 12-8 in the final against Mark Ireland from Sutton Park he threw the jack off the green and never scored again, losing 21-12.
The whole point about this film is that you're gonna see somebody jack off.
Simon Quinn, East Kilbride, said: "The SFA letting Jack off with his red card is shameful.
At 20-18 down, he threw the jack off the green but had another throw with the jack (a specific rule at the Griffin) and again threw it off.
I've no intention of slagging Jack off in any way, but I wanted a chance to put across my side of the story.
However,I am now relying on them less and less,I drop Jack off at a breakfast club at his school at 8 am and my parents collect him after school.
Ryan was able to drop son Jack off at school in the morning, shoot the lucrative advert and be on time to pick him up from school that afternoon.