If your dog is scratching more often or has created bald patches on their fur through scratching, then this may be an indication that they are suffering from some sort of skin infection or irritation. Some breeds of dog are unfortunately more likely to suffer from skin issues than others. However, all dogs can suffer from allergies from things that they come into contact with on a regular basis such as pollen, dust and grass. If your dog is susceptible to allergic reactions, then it is a good idea to remove that item as soon as possible, washing with an anti-allergy shampoo after you have been outdoors for example. Specific areas of irritated skin can be treated with a topical treatment in order to help soothe your dog's skin and avoid further irritation. Of course, any condition that is causing your dog discomfort, primarily when it is impacting overall health, should be looked at by your vet.