I have them on Frontline Plus. I have seen fleas jump on them while on a walk (I happened to be squatting down & one jumped on Mimi girl & I tried grabbing it, but it disappeared into her hair!!
) Lol I'm going to do some more research on Capstar & give them that as well since it's flea season. Fleas stay on our pets only 20% of the time, so I'll be vaccuming alot & bombing the house, also treating the lawn.