A thick, black wax usually indicates ear mites. The mites make the ears very itchy and that makes them scratch them, and it also irritates them to the point of redness. A good miticide should take care of it, and you can get this from your vet.
Definitely yeast infection. If not treated your dog could wind up needing surgery to remove the ear canal itself, you can't let an infection go when it's that bad, MUST TREAT ASAP!!! Probably needs antibiotic, antifungal and drops. My guess is your dog should be on a minimum of 4-6 week course maybe longer. My coonhound when I rescued her was so deeply infected with yeast in the ears she was on Zeniquin (potent antibiotic) for 8 weeks plus antifungals and special compounded drops from a pharmacy.
My dog did the same thing and the vet said she had a yeast infection and bacteria. It does need treated before it swells shut. My dog is on antibiotic and prednisone and an antifungal pill. We also have to put ointment in her ears. The vet said she would be on meds until atleast May. She has been on meds for 3 weeks already.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.