The Whistle Activity Tracker is changing how we monitor our pet's health. The Whistle Activity Tracker can be easily attached to any pet collar to instantly begin monitoring your pet's health. Whistle provides access to metrics such as walks, play time, and rest time. This information is readily available through a smartphone app to allow you to monitor trends over time and ensure that your pet is at their healthiest. The Whistle Activity Tracker is available for $99.00.