On November 15, 1945, a 3 year old black female Cocker Spaniel was admitted to the Stange Memorial Clinic. The history secured stated that this dog had whelped 4 pups 11 days prior to admittance. A few days following parturition the animal became unsteady in the posterior limbs and went down. Upon examination, the dog was found to be unable to walk due to posterior limb paralysis. The muscles of the hind limbs also showed spasmodic twitchings. The body temperature at this time was 106⁰ F.