Well, The Frontline spray did the trick, for the dogs at least. As soon as I sprayed them, fleas were jumping ship from all directions. The next time I bathe them I'll try rinsing them with a vinegar solution. The yard will be another matter... half an acre is quite a bit to treat, but it will be worth it. There is a do-it-yourself pest control store in town that I'm going to check out for flea control. One website reccommended placing a bowl full of soapy water underneath a lamp where the dogs sleep to attract fleas in the house... it works!!