Bog spavin

Name(s): 
Tarsal hydrarthrosis
Nature

Bog spavin is a swelling of the tibiotarsal joint of the horse's hock which, in itself, does not cause lameness. The joint becomes distended by excess synovial fluid and/or thickened synovial tissue bringing about a soft, fluctuant swelling on the front of the joint, as well as in the medial and lateral plantar pouches. Bog spavin is generally an indication of underlying pathology within the joint.

Source: Wikipedia

Broader 
Aggravated by 
Type 
(G) Very specific problems