A 15 month-old female dobermann is seen in your practice. The owners are very sad because the haircoat of their dog is getting progessively thinner. They bought the dog at 4 months age and the haircoat was pretty normal. The problems started slowly at the age of 8 months and progressed soon from the body to head and legs. The dog is not pruritic.
Which 3 differentials would you consider in this patient?