I have to reply to this thread as a loving and devoted Doberman owner myself. I do not want to attack anyone for their personal decisions with their pets.
I am not one to have my dogs live outside full -time but for some dogs like Siberian Huskies and full-coated breeds , they do well outside. But when it comes to a Dobe, they do not. To anyone that has replied that they are supposed to be "guard dogs", they are.But if you have done any research, they were developed to accompany a tax-collector on his rounds .Therefore their personality makes them bond very strong with their owners and they want to live and work close with their Master. To the "guard dog" attitude , that is probably the reason why Dobes have the reputation they keep, as vicious attack dogs.
Being an outdoor dog with a single coat AND skin problems probably isn't helping him any.
There could be many reasons for his skin/coat condition, allergies, vitamin deficiencies, or disease.
I hope you can take something out of all of this and help Kane get better.Good luck .And don't forget to post a photo. I don't get to see too many fawns.