Help keep your cutie canine feeling calm and content with TherapetMD Dog Calming Diffuser Refills. These refills help provide up to 60 days of continuous calm for your pup by providing a blend of soothing mother-comfort and territorial-peace pheromones. Designed to fit perfectly into the TheraPet MD Pet Calming Diffuser (sold separately), the refills help maintain a consistent sense of comfort and security for your pal.