Diatomaceous Earth?

[panophobia]

We have a pretty big flea problem on our hands.  We've gone through two doses of Frontline and a dose of Revolution to no avail.  That's too much money to be spending, both as a preventative and killer.  Our pets are suffering!  It got so bad that our puppy has developed an allergy (to fleas, to medication - the vet couldn't be certain), and one of

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[amazonvera]

Are all of the animals in your house getting Revolution (or the equivalent, I don't know that it's safe for chinchillas or what the equivalent for them would be)? And did you manage to clear up any existing infestations in the house at the same time? If not, it won't be fully effective. If you did, I'm concerned about what you're going to find that's going to work better for you, because that's pretty top of the line in terms of effectiveness. Unfortunately, many treatments either aren't advisable for long term (like steroids), are frequently ineffective with dogs when used without assisting meds (like anti-histamines), or, like many natural treatments, not typically 100% effective, which may be fine for a lot of dogs but not one with an acute flea allergy like my dog and, potentially, yours.

Essentially, I'd really strongly recommend finding a veterinary dermatologist if you can in your area. Like human dermatology, it's a pretty specialized field, and an actual dermatologist may be able to offer you all sorts of solutions and advice, including natural and holistic tips, that a standard vet that hasn't done a pretty intensive specialty in dermatology typically can't. Good luck!