#1 Clear the Yard
Keeping your lawn, bushes, and trees consistently trimmed back will help reduce the population of fleas in your backyard. If you still have a problem, consider using the various yard sprays or granular treatments that are available from your veterinarian, pet store, or local garden center. Or, you might consider hiring a pest control service for regular yard treatments. Just be careful when using these products, as they can be harmful to pets, fish, and humans.