Vet recommended and selling solution to help calm and relax your dog at home Effective and drug-free solution to may help reduce common signs of stress caused by visitors, fears, staying home alone, and loud noises like thunder or fireworks. Helps your dog feel calm and comfortable by mimicking a mother dogs natural nursing pheromones. Heated diffuser covers up to 700 square feet; position the diffuser with the vents up and avoid plugging the diffuser in under shelves and behind doors, curtains, or furniture, for best results place the diffuser where your dog spends most of their time. This product includes 1 refill that will last for up to 1 month (diffuser not included); to maximize effectiveness replace the refill once a month and the diffuser every 6 months.