How accurate are dog-activity trackers?

There are countless gadgets available these days for people to track everything from our heart rate to our stress levels. So perhaps it's no surprise that there also are quite a few products that now claim to similarly monitor ...

Gift Guide: Five fitness trackers offer wide range

There are several fitness trackers to choose from, varying in what they measure and how easy they are to use. Here are five, ranked from budget to sophisticated, to give you a sense of the range available. By no means are ...