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A fractured hip-bone is frequently caused by horses rushing through narrow doorways, and a troublesome disease known as “poll evil” is generally caused by striking the head against too low a one.

Poll evil is a fistula upon the poll, and in no sense differs from fistulous withers except in location.

The description of fistula will apply, then, in the main, to poll evil equally well.

What are the causes of fistula and poll evil?

This is of special importance on premises where several horses develop fistulous withers and poll evil.