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I would honestly ask your vet for advice. Fleas and ticks can absolutely become resistant to some of the pesticides used in the products, but that will differ by region. Your vet should know what works best in your area, as well as what would be safe for your ferrets to be around.

I'd be sure you're treating your ferrets and house too. Capster is really effective at killing adult fleas, but it does nothing for eggs or larvae and so unless you treat the entire environment your dog's simply being re-infested.
 
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