Sorry Lena, I never received the response about your dog. I believe you were communicating with someone else? I know nothing about your dog or what kind of symptoms he is having associated with the allergic dermatitis. When a dog or cat has seasonal allergic response, the symptoms can be quite diverse, but most often they are expressed as a condition called allergic dermatitis, which is irritation or imflammation of the skin. Seasonal allergies can turn into year round allergies if not treated. And when left untreated secondary infections can develop. Allergic dermatitis can also develop from certain diets the dog is eating and can cause inflammation of the gastrointestinal (GI) tract called leaky gut syndrome or dysbiosis, which means the gut is "leaking" allergens into the bloodstream. Diets that create or worsen inflammation are high in carbohydrates. The diet should be low in grain content and no soy, no corn, no rice, no wheat, no organic whole wheat, no tapioca, no peas, no lentils, no chickpeas and no potatoes. You might want to supplement with omega-3 fatty acids. Make sure the omega-3s you choose is tested for purity, are sustainably sourced, ideally come in a capsule or an airless pump to avoid the rancidity issues we see with poor-on oils. I also recommend coconut oil because it contains lauric acid, which has natural anti-fungal properties that can help suppress the production of yeast in you dog's body. The two oils can help moderate or even suppress the inflammatory response in allergic pets.
Keeping you pet clean by giving baths as often as you can with an appropriate pH shampoo for dogs. Rinsing your dog off after being outside paying close attention to his feet helps rinse off any allergens that are on your dogs body.
After rinsing I would follow up with a lemon juice or vinegar rinse to help manage yeast infections. You can dilute them in a spray bottle and spray it on your dog and let air dry.