Thrush.

Thrush.

This is a filthy, fetid disease of the frog. By many veterinary writers it is attributed entirely to damp stables, general nasty condition of stall, yard, etc. Mayhew ingenuously remarks, in addition, that it is usually found in animals that "step short or go groggily," and that the hoof is "hot and hard." Youatt comes to the point at once in saying that it is the effect of contraction, and, when established, is also a cause of further contraction. It is manifest in a putrid discharge from the frog. The matter is secreted by the inner or sensible frog, excited to this morbid condition by pressure of contraction. Its cure is simple and easy if the cause is removed. A wash of brine, or chloride of zinc, three grains to the ounce of water, is generally used to correct the foulness.