Feliway contains a synthetic feline facial pheromone, which helps to ease cat stress and make your cat feel calm and secure, and less stressed. The Feliway Pheromone Spray makes the release of this hormone instant, bringing an instant calming effect to your cat. The Feliway Spray contains a synthetic feline facial pheromone, which helps to ease cat stress and make your cat feel calm and secure, and less stressed. Your cat naturally marks its territory - including furniture, walls and even your legs - using pheromones secreted from his or her face, and this in turn makes the cat feel safe and secure. Feliway mimics this hormone to create a sense of safety and well-being for your cat. Feliway Spray is available in a handy travel sized 15ml Feliway travel spray, ideal for trips in the car, to the vet, or during any time of stress, or in a larger 60ml bottle, perfect for keeping around the house ready for those times when it may be needed.