Put good quality flea product on dog Advocate, Advantix, Stronghold or Seresto. All have environmental control too. Reapply in 4 weeks time if using one of he spot ons. Wash all bedding dog sleeps on at 40. Hover everywhere then spray good quality household spray than contains an insect growth regulator as well as killing live fleas such as Acclaim or Indorex.
^^ This. Plus my top tip of sticking a cheapo flea collar in the hoover bag/ cylinder, they're worse than useless around a dogs neck but will hopefully stop fleas/ larvae escaping after you've hoovered the buggers up!