THOROUGHPIN.
—An enlargement situated on the sides and upper part of the hock joint of the horse, arising from a derangement of the sheath of the back tendon. The fluid with which it is filled can be pressed from one side to the other, hence the term thoroughpin. It seldom causes lameness. For treatment mix a teaspoonful of biniodide of mercury with 4 tablespoonfuls of lard. Rub on a little with the fingers, let it remain on for 24 hours, then wash off and rub on a little lard or vaseline. Repeat the blister every third week until the enlargement disappears. The horse should have rest while under treatment.