Buy some Microtek Anti itch shampoo. (You can get it online). Bathe him every 4 days with it to start, for 2 weeks. Dry dog thoroughly. Then bathe weekly for 3 weeks. Then every 2 weeks for a month. Then monthly. be aware that some dogs do have black skin, as part of their coloring. But the Microtek will get rid of any skin issues.
Search this forum for "Black Chow losing hair, skin issues". He did the above, and it solved it even after many vets were unable to solve it.
Search this forum for "Black Chow losing hair, skin issues". He did the above, and it solved it even after many vets were unable to solve it.