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An 8.5-year-old 17.2-kg (37.8-lb) neutered female English Springer Spaniel was referred to the Neurology and Neurosurgery Service at the Royal Veterinary College for evaluation of thoracolumbar kyphosis and lethargy of 2 days' duration. The referring veterinarian had first examined the dog 6 weeks earlier because of lethargy, and a diagnosis of pyometra was made 4 weeks later for which the dog was treated surgically. Following 2 weeks of sustained postoperative improvement, the dog began to shiver intermittently and adopted a hunched posture. Proprioceptive deficits were then noticed affecting both pelvic limbs. Rest and provision of analgesia did not improve the