Thank you for your inquiry to Drs. Foster and Smith. Fur loss in rabbits with no other lesions can have many different causes, some of which include fur-plucking, barbering, hormonal problems, and previous localized inflammation. This could also be mange or fur mites along with several other possibilities. We suggest taking your pet to a veterinarian to find out the true cause. Normally, the hair will grow back on its own with the proper nutrition and a healthy diet.