... door. We tried everything: toys, treats, leaving the TV on, three different apps. Nothing held. I started reading the research on canine auditory stress responses and realised the existing apps were built for human ears. Calming playlists, binaural beats, naturesounds, they feel right to us, but dogs hear differently. Their stress frequencies are different. What relaxes a human can be neutral or even agitating for a dog. So we built something calibrated for Henry, not for humans. Frequencies, patterns ...