Here's what's finally gotten my dogs' horrible allergies under control: she's allergic to flea bites and the harmful spot-on treatments had ceased to work, so I took her off and put her on chewable garlic and brewers yeast tabs. They stopped biting her after a few weeks. Combed her everyday to get them off her. I have a huge yard and cats that are indoor/outdoor and are able to wander over to the neighbors' yards so they bring them in. Diatamacious earth on the lawn lessened them but still have to do lots of flea combing. Put the dog on holistic grain free food and at night she gets raw- the chicken in the big sausage kind. Tried various shampoos and AVC rinses, so-so. Tried enzymes etc. Found a spray called Dermacton and a bar shampoo they make. Shea butter oil and essential oils that have moisturized her coat and also repels fleas. She stopped itching like immediately and smells devine. She doesn't really like being sprayed but seems to know it helps. This past week she's been scratching some more and I think it's because she's been off the raw food. So... It seems to be a combination of keeping her on the raw food with a pinch of kelp added, washing her feet to get rid of the stuff she walks through and spraying her every other day or as needed with the spray. The spray has definitely made the biggest difference though. Just wish they'd lower the price.