Like any vertebrate if there is a curvature of the spine it is known as Scoliosis. A disease that affects mammals, Reptiles, and Amphibians. It usually shows up during their development as they grow and mature. Usually being hereditary, but can come from a Calcium deficiency or MBD(Metabolic Bone Disease) Which is a very serious disease caused by a severe lack of calcium causing brittle or rubbery bones. Can also be due to a lack of Vitamin D3 which is used by the body to metabolize calcium to bone.
If you look at some of the pics of his back closely you can see the curvature at the lower left.





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