He was diagnosed four years ago, but has never had any symptoms or been ill. I needed to get some information. Your cat has a disease that develops slowly with little sign of any problem for years.
Specific treatment is limited to the specific stage of the disease.
In general, protect against infections and have your kitty examined by a veterinarian at least twice each year and at any time there are signs of an illness. Review nutritional support with your veterinarian. The vet took x-rays which showed her spine is fusing. We no longer let her go up and down the basement stairs because of the trouble with her hind legs. I would appreciate any help you could give me.