Degenerative hip disease in dogs

[sailorptah]

I need to find a degenerative hip disease that would cause problems for an older (teenage) dog. It can be a lifelong or chronic thing, so long it's plausible for the dog to live that long before the symptoms really start making trouble.

Browsing Wikipedia for dog diseases didn't turn up anything useful, so I would appreciate some pointers. I can look up more information on my own once I have a name, but if you have more details/information, that would be great too.