Cathy,
I can't say I know much about the Rankins, but most dragons and reptiles have pretty close to the same needs and suffer from the same maladies and have the same needs, such as MBD. Proper lights, heat,calcium, minerals, UV ect. are so important. Perhaps the shop you got it from can offer advice. Or maybe find a vet that knows about the Rankin. Please tell me what you find out.
Diana