Archer R, Sissener T, Connery N, Spotswood T. Calgary Animal Referral and Emergency Centre, Calgary, Alberta T2H 2Y4. rmadvm@gmail.com Can Ve tJ 2010 Mar 51 3 301-4 Abstract A 10-year-old cocker spaniel bitch presented with severe lumbosacral pain and acute onset left pelvic limb lameness. A diagnosis of asymmetric lumbosacral transitional vertebra with disc protrusion at L6-L7 was made by computed tomography. The cauda equina and left L6 nerve root were surgically decompressed with a dorsal laminectomy and lateral foraminotomy, which led to rapid resolution of the clinical signs.