Will the products still work even if my pet gets wet in the rain, or if I shampoo him?

If your pet gets wet in the rain during a short walk, this will not interfere with the effectiveness on any flea control product. The effectiveness of some sprays may be reduced if the pet is washed with a harsh shampoo or detergent soap. The Allergroom Shampoo is proven not to affect the performance of other flea control products such as Frontline and Advantage.