Brushing will only make the matter worse as the brush pulls up more dead skin.

Bottle of sprint oil to feed nightly with as myanimall said 1 teaspoon of cod liver oil twice a week should have the coat looking spot on - But of course it doesnt happen overnight - Give it a good 2-3 weeks.

A bath every 4-5 days with anti doggy dandruff shampoo should do wanders.