I have a dog that is itching loosing hair its not mange can any one send me pictures of other skin problems

the dog is also chewing at herself i have seen mange befor thats not the problem its my friends dog i said flea problem alergy from bites she said the dog never had an alergy to flies befor i would like some pitures of other typs of dog related skin condisions to see if i can figure out this problem thank you
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