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Hello, this is Dr. Jess. I am sorry to hear about your pup's problem! Can you tell me if she has any crusts or scabs or bumps that look like pimples on her skin? Is she on a flea preventative?
I am very glad to hear that she is on Trifexis. The area you are describing is the most common area for itching/irritation due to fleas. Even if you don't think you see fleas, some dogs have an allergy to flea bites and just a few bites can make them intensely itchy like this. And even though she is on Trifexis, it can still be possible to get a flea bite, so that could be the initial cause of her problem. It is possible that your pup has developed a secondary bacterial infection of this skin due to the chewing/itching and may need an oral antibiotic or steroid to decrease the inflammation. I would stop using dawn to wash her weekly because it could be drying out her skin and making things worse. I would also stop the peroxide and baking soda. You can continue the bacterial spray and I would use a hydrocortisone spray several times daily as well until you can get in to the vet to see if an oral steroid is needed. She needs an e-collar (cone) temporarily to stop her from biting/chewing the area because it will not heal if she keeps biting at it. It is possible she has developed what is called a hot spot. We often end up shaving the area so that it can be thoroughly cleaned and isn't remaining moist and contaminated. I have attached two articles on allergies and hot spots for more information.
Please let me know if you have any other questions!