The number of vertebrae in individual Homo sapiens actually varies between 32 and 35, with the biggest range of difference in the pelvic area. (discovermagazine.com)
Again and again, animals of various species domesticated at different times in different parts of the world develop the same domestication syndrome characteristics: more extensive breeding periods; smaller brains, hearts and teeth; small or floppy ears; spotted coats; curly hair and tails; variable numbers of vertebrae in the spine; and juvenile faces with shorter snouts. (sciencenews.org)
When disks between vertebrae in the cervical (neck) or thoracolumbar (chest and back) areas of the spine degenerate, the inner disk material can protrude or rupture into the spinal canal. (petwave.com)