The spray is not harmful. The burst of spray distracts or interrupts your dog’s pattern of behavior. The scent of the spray is available in lemon, citronella or unscented. Some dogs find one scent to be slightly more unpleasant than another and this can make fast training at times or you, as the owner, may have a preference. Regardless of the scent, the spray dissipates quickly and is safe for humans and pets.