Stress in a dogs life either caused by seperation anxiety or sensitivies to loud noises can lead to many behavior issues such as excessive whining, destructive chewing, constant trembling and more. Many dog owners are using pheromone based products to help combat these behaviors. One of the more popular products on the market is a pheromone based air diffuser by Comfort Zone. Comfort Zone air diffusers were designed to gently release a chemical produced by nursing dogs known as appeasing pheromones into the air, making your dog feel safer and more secure. Your dogs happiness and security play a big role on how your dog behaves.