-Change their food to a chicken free formula, it is common for this breed to develop allergies to Chicken. Completely erase chicken from their diet, no treats, chews, scraps, or bones that contain chicken.
-Use Oatmeal or Chamomile based shampoos that are gentle and soothing to their skin.
-Ask your vet if your dog could be suffering from Pyoderma which is a bacterial infection in the skin that can be quite common in dogs.
-Ask your vet about a medication called Apoquel (or similar product,) I've heard great reviews and my vet also said that he uses it for many of his customers.
-Ask your vet if your dog could be having an allergic reaction to the flea/tick topical that you are using.
-If you don't treat your dog with a flea/tick medication could they have fleas?
-Pay attention to the time of year that your dog becomes itchy, just like humans they can have allergic reactions to dander and pollen that are seasonal and medications can help relieve their symptoms.
-Pay attention to when their reactions are most prevalent, did you just do the laundry? Did you just burn a scented candle? Did you just use a cleaner in the house? Do you use essential oils in the house? Dogs can have reactions to ingredients found in many household products.
-If they are scratching at their ears check to see if they have ear mites or a yeast infection. Ear infections are quite common in floppy eared dogs.
A popular product that may help is called Coat Defense, here is a link to their website:
As with all products, check with your vet before using them to be sure they are safe for your animal.