Whistle is like a fitbit for your dog and has it's own app.
The device, a small metal disc that can be attached to a standard collar, is akin to human activity trackers like FitBit and FuelBand, but can tell you a lot more about your dog than just how active he’s been recently.
Whistle connects to an iPhone app, which keeps tabs of the accelerometer, and lets you know how many minutes your dog’s spent resting, playing, or walking over any given span of time.