hmmm...Capstar and Advantage - yes I would think that would have taken care of the fleas. Do you use Advantage on the other animals? If not, maybe some of the still alive fleas could have left Emma and have been living on them? You can also bring fleas in from the outside on your shoes and clothing. I would give everyone a dose of Advantage at the same time. That should take care of it. Then flea season should be over for awhile!!!