Vet's Best Outdoor Flea & Tick Spray for Dogs is a concentrated formula that’s made using nature’s most powerful plant extracts, including a unique blend of peppermint oil and eugenol from clove plants. It is proven effective to kill mosquitoes, fleas, flea larvae, flea eggs and ticks by contact without the use of harsh chemicals. A 32-oz bottle can treat up to 5,000 square feet.