Amazon.com: Whistle GO Explore GPS + Health + Fitness Dog Tracker Plus Health & Fitness Monitor, Waterproof, Safe Place Escape Alerts, Built-in Light, Fits on Dog Collar, for Dogs 25 lbs and
Whistle 100-30502-00 GPS Tracker and Activity Monitor 604945283322 | eBay
Whistle GPS Pet Tracker
Whistle FIT Pet Activity Monitor helps you keep your pet healthy
Best Buy: Whistle Activity Monitor for Dogs Silver/Black W01A