Diatomaceous (spelling?) earth, garden grade not pool grade. Sold in garden centers and feed stores. Dust your dog with it and his bed, anything. It is not toxic, the only caveat is to not inhale it as it is a fine dust. Our local Dave the Garden Guy on TV has even tasted it to show it is not toxic.
Have you considered that it's not a flea allergy? He could be allergic to his food. Try changing his food to a soy and corn free variety.
Look up on the internet uses for apple cider vinegar. You can dilute it and spray it on, they also suggest adding a teaspoon to their food. Also look up Home Remedys for Dogs Hotspots. You will find tons of things.
My dog is the same way and I can not afford a vet either so I try what sounds like it won't burn her skin. Be careful though as you will be shocked at some of the things that are bad for dogs. Check them out carefully. I also heard adding one fish oil cap to their food helps their skin. I'm trying that next.
My mom lives on a farm and when her cats got fleas really bad she douched them in vegetable oil and let them stay outside til the oil was off on its own. The fleas never came back. I don't know if you have money for vegetable oil or how big or small your dog is or even if you can have your dog outdoors but its an idea. My mom swears by it that it kills the fleas, it seals them in and kills them and the eggs and they don't come back. If you have the dog indoors I recommend doing this outdoors and then bugging your house so that no fleas in the house stay. Also if fleas don't have a dog they will go to the next host which is you!
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