This article was taken from the March 2015 issue of WIRED magazine. Be the first to read WIRED's articles in print before they're posted online, and get your hands on loads of additional content by subscribing online.
How we tested
With help from the volunteers and residents of Battersea Dogs
& Cats Home, WIRED tracked a number of animals as they explored the grounds. We attached the devices to dogs of varying sizes and noted how readily they accepted the tags and how accurately their paths could be mapped remotely. The cat, Effra, was allowed to wander at will.
This article was originally published by WIRED UK
