when i first had sprite, she had dry flaky skin. my vet gave me these vitamin E pills for dogs. they were called Derm Caps. it worked.
and i didnt have a problem after that.
or it could be allergies. dust, pollen, grass, stuff like that. you might only need bendedryl for children to solve that problem.
definitely talk to a vet about it. you dont want her scratching till she bleeds or something.