Fleas love sand. A new generation of flea control products were introduced a number of years ago that, when taken orally once a month, breaks the life cycle of the flea be leaving it sterile. These products do not kill fleas, but prevent future generations. Sprays and powders might still be needed to control those that remain. Once obtained only with a prescription, brands are now available over the counter.
Varieties are available for both cats and dogs.
For even greater convenience, vets can prescribe a combination product that not only controls fleas in this way, but prevents heartworm, too. Products with even greater effectiveness are now available. They come in ointment form and are applied monthly to the fur of cats and dogs. Fleas and larva are killed as the product works its way through the coat by way of natural skin oils. Different brands are available, both over the counter and through your vet.