What is "louping"

Louping \Loup"ing\n. [From Loup to leap.] (Veter.) An enzo["o]tic, often fatal, disease of sheep and other domestic animals, of unknown cause. It is characterized by muscular tremors and spasms, followed by more or less complete paralysis. The principal lesion is an inflammation of the membranes covering the brain and spinal cord.