Spavin
a disease of horses which occurs under two different forms, both interfering with soundness. In young, weakly, or overworked subjects the hockjoint is sometimes distended with darkcolored thickened synovia or joint oil. This is bog spavin. The second variety of spavin is the more common. Toward the inside of the hock, at the head of the shank bones, or between some of the small bones of the hock, a bony enlargement may be seen and felt. This is bone spavin. At first there is tenderness, heat, swelling, and considerable lameness; but as the inflammation in the bone and its investing membrane abates the lameness may entirely disappear, or a slight stiffness may remain.