How to Give a Flea Bath
I'm a dog person, good luck giving a cat a bath. The principles are the same but how you hang on to a screaming, clawing cat is your problem. hehe. Have fun.
You will need:
A flea free place to let the dog dry off.
Frontline or Advantage Plus (from your vet)
If your dog is all matted up, you need to get that taken care of first. Either brush him out or give him a haircut but it is pointless to try to bathe a dog with mats.
You can't just soap up your dog and hope for the best; there is a bit of an art to this.
You can use any kind of flea shampoo except that you need to use kitten shampoo on kittens and cat shampoo for cats. It doesn't have to be super strong or anything because mostly the fleas will drown before the soap kills them. In fact you could probably just use regular shampoo, it is just that flea shampoo has a nice extra kick to it.
Prepare his bath water as usual. It should be warm enough to be comfortable and for depth, about halfway up his legs is probably just fine. Start by putting a band of soapy water around his neck. This keeps fleas from running up his body to hide in his nose and ears. This is important to do by the way, don't skip it.
Then you pretty much just soap him up and wash him down from head to toe. It is important that you soak him to the skin and keep him totally wet and nice and soapy for at least 10 solid minutes. That is how a vast majority of the fleas are killed. A quick wash and a rinse won't do it, fleas are tough that way. 10 minutes is a long time so try not to cheat. Be sure to get all of the little nooks and crannies (don't worry, dogs aren't easily embarrassed).
Once he is rinsed off, you will need to dry him and get him out of the house or at least confine him to someplace that is flea free. Once he is totally dry (and I mean totally) you can apply either Frontline Plus or Advantage. Your dog should remain free of fleas for months. whew!
But now the fun really starts because you need to treat the house.