If your dog has skin allergies, his skin is dry and itchy and possibly even tender and sore. You need to be extra careful bathing a dog with skin allergies because you don't want to cause any more dryness. You also don't want to cause your dog any discomfort or pain. Water and soap or shampoo on any open sores or wounds or even dry, flaky spots could cause pain or burn if not done with the right products or even if washing is overdone. Baths given too frequently can cause your dog's skin to become dry and flaky. Dogs who deal with skin allergies have a tougher time taking baths.
If your dog's skin is tender or sore and sensitive, he may be a little apprehensive about getting in the bath. He may also associate bathing with pain and discomfort if his skin allergies are really bad. Ease his discomfort by using natural products and products meant to soothe allergy irritated skin. Also, be sure to offer your dog lots of love, understanding, and treats while bathing.