On December 15, 1958, an eight and one half year old male German Shepherd entered the I.S.U. Veterinary Clinic for examination with a history of incoordination and convulsions. Since about September 15, 1958, the dog had several convulsions, the last of which was rather violent and accompanied by a temperature of 104° F. He had appeared normal and in good condition on November 3, when examined by another veterinarian except for a peculiar crossing over gait and an occasional collapse of the rear quarters. At times the front legs seemed to be involved. The dog had been kept on KjD (Hill Packing Co.) because of a mild chronic nephritis. But on December 15, the Shepherd had deteriorated markedly and had lost a lot of condition. although the appetite was reported to be good. The motor control of the hind legs was very poor. Motion being extren1ely difficult, he fell over or went down behind quite often.