Bog Spavin

Bog spavin is fluid distension of the high mobility joint in the hock called the tibiotarsal or tarsocrural joint. The swelling can be seen and felt at the two superficial outpouchings of the joint capsule; at the front towards the inside and on the outside just below and infront of the point of hock. If one swelling is compressed this usually causes the other swelling to enlarge temporarily and vice versa. Bog spavin can occur in one or both hind legs.