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If there is a flea problem then it is best and most effective to get flea drops (frontline plus, K9 anvantage etc.) or the seresto flea collar.
Scratching absent the presence of fleas is usually due to airborne allergies. These can be seasonal or year round depending on what the dog is allergic to. Dogs with this allergy usually also begin licking their feet.
Your vet would be best to make the determination of an allergy or other skin problem such as mites.
IF it is due to an allergy there is a new medication out that can stop the scratching within days, but it is only available through your vet office. It is called Apoquel.
With airborne allergies if much is coming from the outside air as apposed to dust or dust mites in the home, then you can help by wiping down the dogs fur and paws after you let her outside as this can take some of the pollen off the coat so she is not breathing it in while inside. For inside allergies such as dust, then a room air purifier in the room where she most spends her time can make a difference. So can a let dry carpet spay to keep dust from rising from a carpet each time the dog or human moves in the room