X2
Diatomaceous Earth is the best natural treatment ever! Even the non food grade kind. You can dust your animals with it directly. And because the diatomaceous earth is little sharp particles of diatoms, it literally cuts apart all the mites and fleas to death. Its harmless to the animals.
And the food grade kind can be ingested to get rid of internal parasites.
If you want a really good chemical flea treatment, get Revolution. It does ticks, fleas, ear mites, and heart worms. Way better than Frontline or Advantage.
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