Extreme Hair Loss Dogs

What causes extreme itchiness in dogs? I have two young dogs that have started to bite and scratch themselves a lot
They bathed once a week with shampoo or flea and tick. Recently I switched to a shampoo designed specifically for allergies and did not care either. Both are white dogs and the fleas are not visible at all on them. Both symptoms of ear mites and treated by him. They are scratching and biting his hair in spots. I can not afford a vet bill and I'm high a loss of what to do for them. They look miserable. Please help!
It seems that allergies skin, probably caused by food. Check your dog food to see if there is corn in it (the most common allergy) Many, if not more, white dogs can not tolerate no corn. Feed a high quality food without corn, soy, food dyes or wheat. This supplement is also a great help any problem the skin> http://springtimeinc.com/product/88/ 2
Dog Hair Loss, Mange and Mites
