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