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The skull-cap, the meninges, and the dorsal surface of the cerebral cortex were inspected in 20 Scottish Terriers subjected to euthanasia because of severe Scotty Cramp, and in 1 Cocker Spaniel and 2 Scottish Terrier puppies sacrificed because of Splay (inability to stand on the hind legs). Apparent abnormalities observed in the 12 younger (6 weeks to 18 months old) Scotty Cramp animals were firm medial adhesion of the dura to the skull-cap (all animals), meningeal hemorrhage (10 animals), and bony jags on the inner side of the skull-cap making impressions in the underlying dura and cerebral cortex (8 animals). Similar bony irregularities causing durai and cortical impressions were observed in 5 out of 8 Scotty Cramp dogs belonging to a senior age group (3 to 11 years old). Meningeal hemorrhage was observed only in 1 animal belonging to this group, but consistent observations were scarified appearance of the dura along the midline and induration around superior cerebral veins medially in the cruciate sulcus. Meningeal hemorrhage and firm medial adhesion of the dura to the skull-cap were consistent observations in the Splay puppies (6 weeks to 3 months old). The possibility is discussed that the ultimate cause of Scotty Cramp and Splay may be abnormalities in the development of the parietal and frontal bones, of their interconnection, and of their relation to the underlying meninges. This in turn may exert mechanical, circulatory or other influences causing dysfunction of the cerebral motor cortex.

On the Etiology of “Scotty Cramp” and “Splay” — Two Motoring Disorders Common in the Scottish Terrier Breed