You need to get a flea preventive and put it on him like Frontline or Advantage something like that. You are not suppose to bathe GS as much as you are because it strips the natural oils that their coats need. They should not be bathed more than once a month. You need to rid the fleas another way besides bathing. Topicals work great. Another reason for frequent itching is their diet. You need good food because there is a lot of allergens in supermarket foods that could be adding to the itching problems.