http://education.vetmed.vt.edu/Curriculum/VM8644/kconnors/home.htm

The site provides a sectional atlas of the normal canine lumbosacral spine in three planes: transverse, sagittal, and dorsal. Lateral and ventrodorsal radiographs of the lumbosacral spine serve as localizers for each series. Each series was constructed using photographs of frozen gross anatomic sections.