Can anyone offer me some advice about dealing with fleas?

This is the first year I’ve ever even seen a flea! But so far one dog has them and is allergic and one dog is covered in bites. It doesn’t seem like the cats have any, but they have such long hair it’s hard to know for sure. So far, we’ve bathed both dogs in Dawn twice as well as two flea shampoos. We’ve flea bombed the house, and are treating with the oily stuff on their shoulders and backs (the dog that’s allergic is also on a monthly pill that’s supposed to kill the fleas when/if they bite her) . We’re also treating the cats, but again they don’t seem to have them. We’ve also tried lavender, lemon, and mint. Nothing seems to get rid of these fleas for more than a day. We also have a bird that does not seem to be effected but there doesn’t seem to be flea prevention for birds. Could he have them? For the most part, all of our animals are inside. The dogs of course go outside to “do their business” and one cat spends most of the day outside and the night inside. We live in town, but it is a rural area, so there is plenty of grass and trees all around us. Is there something we should be doing outside (can you bug bomb outside?) ANY advice is welcome!