Let me tell you what my thoughts are. Dogs like people can have or develop allergies to things. It can be foods with beef, wheat and soy being common allergens. It can be treats, cleaning supplies, air fresheners, pretty much anything. However, odds are your dog came into contact with the allergen right before she started having ear issues and skin issues.
Allergies often cause a dog to scratch the ears and skin. The skin's immune system becomes compromised and this allows the staph and yeast on the skin normally start to multiply unchecked by the immune system. In turn these yeast and skin dermatitis can lead to hot spots, rashes, darkened skin, excessive shedding, ear infections and even an upset stomach. An upset stomach can cause bad breath.
Worse is that even though the allergen can be removed form the situation, it might take up to 6 weeks for improvement to be seen and any kind dermatitis has to be cleared up as well. So basically most of the problems could be explained by an allergy condition. Also even if the allergen was removed if the skin dermatitis wasn't treated with antibiotics or anti-fungal medications, the cycle of scratching, ear infections and skin issues would continue. Staph usually occurs on the lower regions of your pet and tends to have small pimple type bumps. Shampoo containing Chlorhexiderm and/or Oatmeal can help with this condition though it does not cure the allergy. Yeast typically shows as a greasy area that has a sweet musty odor. Sometimes the skin can become inflamed, darker and thickened due to itching. Yeast likes areas such as between toes, armpits and ears. Selsun Blue Shampoo can help with Yeast dermatitis. When shampooing, lather and leave on 15 minutes before rinsing. These shampoos are not meant to be a cure, just a relief until your pet can see a Vet.
here is some information on allergies.
You can read about allergies here: http://www.vcahospitals.com/main/pet-health-information/article/animal-health/allergy-general-in-dogs/428
Here is a site that goes over itching in dogs.
A food trial might help to identify the allergen. I'd also get a probiotic to help with her gastrointestinal tract and perhaps help if she has any nausea. You can pick some up at a local pet store. Benadryl might also help control symptoms and her itchiness. There are other causes for itchiness such as mites but a vet would need to do a skin scraping to check for those.
The condition of her teeth do concern me. Bad teeth can lead to bad breath but also can affect the organs serious impact their function. So she really does need to see a vet. Perhaps an antibiotic would at least put off the need for a full dental until financial arrangements could be made. There are programs available to help people with vet bills. A lot of people apply to them so apply to as many as you can.
Veterinary Bill Assistance Programs:
1. The Big Hearts Fund: http://bigheartsfund.org/
2. Cats in Crisis: http://www.catsincrisis.org/
3. Diabetic Cats In Need: http://fdmb-cin.blogspot.com/
4. The Dog And Cat Cancer Fund: http://www.dccfund.org/
5. Frankie's Friends: http://www.frankiesfriends.com/
6. Handicapped Pets Foundation: http://hpets.org/
9. The Mosby Foundation: http://themosbyfoundation.org/
10. The Onyx and Breezy Foundation: http://www.onyxandbreezy.org/
11. Paws 4 A Cure: http://www.paws4acure.org/
12. The Pet Fund: http://thepetfund.com/
13. Pets-DC: http://www.petsdc.org/
14. Shakespeare Animal Fund: http://www.shakespeareanimalfund.org/
This site may have additional resources as well.
These vets may offer a free initial visit though you may have to pay for extra procedures and medications. See the next one for the coupons.
I hope this information is helpful to you. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have . If you do find this helpful, please take this opportunity to rate my answer positively so I am compensated for my time.