[Danny_Ocean]

I had a possum living under my house and the fleas were insane. My cat, who never went outside, had fleas from the possum.

First thing: get rid of the possum! Trap it, or call a wildlife rescue service to trap it. Get rid of anything in your yard that attracts possums (dog food, water bowls, dropped fruit, etc.).

Then, treat your dogs with a flea medication (Frontline, etc.). Keeping the dogs inside during flea season will help, too. What kind of dogs are they? If long-hair, you may want to have them shaved in the summer to make it easy to see/remove the fleas. Brush the dogs daily. Bathe weekly.

Treat your carpeting indoors with boric acid (powder!). This will eradicate the eggs.

Final advice: Dogs + fleas = headache. Get a cat.