My 4-legged indoor/outdoor pets don't have fleas. I do nothing specifically to create a flea-free environment, except that a couple of pet guinea fowl patrol their yard eating mosquitoes, roaches, etc, as they go. Come to think of it, my house is also free of fleas. Not bad for a couple of funny looking, strictly outside guys. Guineas rule!
Cheers, Patti, central Florida (otherwise known as mosquito, roach and flea heaven)