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  • fleas have become resistant to some poisons, so if they've had drops but still have fleas you should try another that has a different ingredient. You should wait 4 weeks before putting any more drops on them though because poison.

  • Sorry,I was unclear. The vet noticed the fleas...well one flea, on one cat. Then treated both cats.

  • Yes. And you said they still had fleas. So work out whatever the vet gave them, look up the active ingredient then use a different one, as long as you leave 4 weeks between applications.

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