The Zenidog Pheromone Diffuser is a passive gel diffuser containing a synthetic analogue of the canine appeasing pheromone that nursing mother dogs naturally release. The gel sits in a discreet container with no visible mist or sound, and once opened it diffuses continuously into the surrounding air for coverage in rooms up to 750 square feet. No electricity, batteries, or heat source is required, making the diffuser fully portable for use at home, while traveling, or during boarding stays. The scent is intended to be undetectable to people, so it blends into a household without adding noticeable fragrance. Each unit comes ready to use in its own container and ships in a recyclable box. Setup involves removing the seal and positioning the diffuser in the area where the dog spends the most time, replacing it after the labeled diffusion period for continued use.