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This itching may or may not be related to mange. The area that he is affected by is a common spot associated with fleas and flea allergies as well. Do you know if he has been treated for fleas recently?
For now, there are a couple of things that we can do to try to help him feel more comfortable and prevent further damage to his skin.
First, I recommend purchasing an Elizabethan collar or similar product from the local pet store. This can be the traditional hard plastic cone, a softer vinyl cone, or an inflatable neck collar that prevents him from turning his head back to his tail.
You can also start a dose of over the counter Benadryl. When you see my post, respond with his weight and I can help you with appropriate dosing.
OK, you can give him 3 tablets of Benadryl (each 25 mg diphenhydramine) every 8-12 hours as needed to control itching. Make sure there is no added decongestant product, as these are toxic to dogs.