If you can get some beef suet from the butchers it would help heaps. If you add some in his dinner each night it should help increase his fat content and put a nice shine on his coat. He could be lacking some basic nutrition too. With my greyhounds I don't feed any dried food, especially kibble .. I hate the stuff ... but give a variety of meats e.g. beef, chicken, turkey and sometimes mackeral. I also put vegs in blender such as parsley, carrots, apple, spinach, cabbage and give a tablespoon over their din dins. (Also beef suet reguarly)..they have the most beautiful healthy coats. I cook sometimes oats for their breky and put A2 milk over top... pretty yummy.