This sometimes occurs in the mule. It is a sudden, nervous, quick jerk

of either or both of the hind legs. In the mule it frequently shows but

little after being worked an hour or so. It is what I regard as

unsoundness, and a mule badly affected with it is generally of but

little use. It is often the result of strains, caused by backing,

pulling and twisting, and heavy falls. You can detect it in its

slightest form by turning the animal short around to the right or to the

left. Turn him in the track he stands in, as near as possible, and then

back him. If he has it, one of these three ways will develop its

symptoms. There are a great many opinions as to the soundness or

unsoundness of an animal afflicted with this complaint. If I had now a

good animal afflicted with it, the pain caused to my feelings by looking

at it would be a serious drawback.

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