Rat terrier is an Itchy Buger. Please Help!

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Hello myLot! This is my first topic starter. I Hope it goes well. I have two Rat terriers and I will never own another bread they are the greatest dog in my opinion. Saber Marie will be 11 years old in December and is about seventeen pounds and Sara Ann is 3 years old and about seven pounds. They are both females and they live under the same house, this is the only three things they have in common. Sara is my sickly, when I picked her up from the breeders, she had drainage in her eye. I was told it was allergies. I thought, No biggie we all have allergies, right? Well turns out the first two weeks I had her she was at the vet 4 times. I lost track after the first month. She is Deaf, Can not see to well, She has broken her leg trying to be supper dog. I almost lost her due to liver damage and kidney damage, which I never figured out what caused, But the funny thing is she acts like any other dog. Has more energy than ten other dogs I call her burger. She really lives up to her name. You would never know she has issues if you saw her. I was wondering if anyone had any ideas for Itchy buger. I was taking her to get allergy shots but it cost 60.00 every 2 months For 3 years do the math. I have tried over the counter medicines, oatmeal bathes changing her diet among other things. The diet thing helped but she still is having trouble. She has her armpits scratch raw and her ears and belly bald. I wonder if it is possible for here to have a fungus from licking to much. From what I see Rat terriers are alcoholics they always have their licker out. ( Joke) anyway I am open to suggestions or idea's. Please Help!