Product Description CalmPaws Dog Diffuser Refills Keep the calm going. Don't let the bottle run dry. If you already know what CalmPaws does for your dog, you already know what happens when it runs out. The pacing comes back. The doorbell becomes a trigger again. The dog who finally started settling on the couch is suddenly back by the front door, ears up, watching. Most dog parents don't notice the diffuser is working until it stops. These refills keep your dog's calm baseline running without a gap. Each refill includes: 30 days of continuous coverage per bottle The same vet-formulated synthetic dog-appeasing pheromone as the original kit Drop-in compatible with your existing CalmPaws diffuser Drug-free, odorless, and safe around kids and other pets How to know it's time for a new refill: The liquid line is below the label It's been close to 30 days since you last swapped You start noticing the old patterns creeping back We recommend setting a reminder for every 25 days so you never run out. Or save 15% and skip the math entirely with our subscribe-and-save option.