Limber tail syndrome, or acute caudal myopathy, is a disorder of the muscles in the tail, usually affecting working dogs.It is an injury occurring mostly in sporting or working dogs such as English Pointers, English Setters, Foxhounds, Beagles, and Labrador Retrievers. Limber tail syndrome is also known as swimmer's tail, cold water tail, broken tail, dead tail, "happy tail" or broken wag. [Source: Wikipedia 
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