Do flea sprays really work?
The old-fashioned pesticide-based flea sprays work fairly well to keep fleas off your pet for 2 to 3 days. However, these same sprays have well-documented toxic side effects, cause skin irritations, and can cause respiratory problems in people.
The most effective flea spray on the market is Frontline. A thorough application of Frontline, dosed on the pet's body weight, is very safe, and will last a full month. At Windmill Animal Hospital, we do not recommend any flea spray except Frontline.