A 6-pack of large dog Frontline arrived this morning and after lunch I applied some to Morphy. I looked it up and this stuff gets absorbed through the dog's skin and then secreted through his oil glands. Within 24 hours he should be flea-free but during that transition, the fleas recoil away from his skin and can be seen on the outside of his fur.
I'm watching the little buggers crawling around on him now. It's very gratifying to think that they will all be dead in about 12 hours.