My dog has fleas! I gave them both Frontline drops two days ago, but the larger one, who has long shaggy hair, still has fleas (plus a big tick that I would have expected to drop off by now. Is it safe to give him a spray of Frontline as I have some in the house? I am going to spray their bedding with flea killer, and then wash it at high temperature. I don't want a houseful of fleas! Is anybody finding that Frontline is less effective than it used to be? Has anybody tried the flea collars available here? They seem too cheap to work, but maybe not? Or any other suggestions?