Feliway is an indoor spray that acts like pheromones. Pheromones are natural substances secreted by an animal to communicate with other members of its species.
Cats use pheromones to communicate in a number of ways.
Pheromones produced by the pads on their feet tell cats to avoid dangerous places. Pheromones produced in the tail and anal sacs provide sexual information for mating. Facial pheromones make cats feel calm and secure. Cat urine contains pheromones used to mark territory to demonstrate dominance or attract members of the opposite sex. Cats resort to urine marking because they are positively or negatively excited.