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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.
Typically (for most dogs) the cervical enlargement is centered at the C6-7 intervertebral disc; spinal segments of the thoracolumbar junction are within nominally corresponding vertebrae; the sacral segments are within vertebra L5; and the functional spinal cord terminates at the L6-7 vertebral junction.