You don't need both. Comfortis does essentially the same thing as Capstar, it just takes longer and lasts longer. The only reason to give them both is to kill the adult fleas immediately with Capstar and then have a month of continued protection from Comfortis. If you aren't starting either right now, then it would be urgent enough to give both unless I'm missing something. That said, if your vet said to, then you probably should...
Ok, reread. Yes, you could give it today and Comfortis on the weekend. A bath with Dawn would accomplish much the same as the Capstar though.
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