Best GPS Dog Collar The Best GPS Dog Collars of 2018 1 Whistle 3 GPS Pet Tracker and Activity Monitor Best Price and Battery Life The MUST Know, True Facts about Whistle 3 GPS Pet Tracker and Activity Monitor In 2015, Whistle bought out the Tagg GPS tracker system, which was a subsidiary of Qualcomm. Tagg trackers were leaders in the GPS market … [Read more...]