Cutter Backyard Bug Control Spray is said to kill fleas ... so you just need to attach it to a garden hose and apply it to your yard. While the company says it is safe for use around pets ...

To use, you only need to connect to the garden hose and start spraying. This product is odor-free and non-staining. Ortho Home Defense Insect Killer for Indoor & Perimeter2 Ready-To-Use Trigger ...