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The average dog has 26 vertebrae. 7 cervical, 13 thoracic, and 6 lumbar. Some breeds such as the English Bulldog may frequently have a 7th lumbar vertebra, or a portion of a vertebra called a transitional vertebra. The average dog has 26 vertebrae. 7 cervical, 13 thoracic, and 6 lumbar.
Each segment gives rise to paired spinal nerves (click left image). Dorsal and ventral spinal roots arise as a series of rootlets. A spinal ganglion is present distally on each dorsal root. The canine spinal cord has 8 cervical, 13 thoracic, 7 lumbar, 3 sacral and 5 caudal segments. The following table compares species.