October 23, 2015 12:45 pm Fitness Trackers for Pets Fitness trackers are a popular way to keep an eye on your daily activity. Now, some unusual users are reaping the benefits. Mark Barger explains. US & World Videos 4:09 Budgets, staffing, and social media can all impact violence in schools, administrators say 2:35 Sumner Tunnel closed for weekend 2:16 Bruins fans disheartened by season-ending loss 1:04 Police investigate killings of 2 swans in Westford 3:22 Ethan Hawke at Coolidge Corner Theatre for ‘Wildcat' screening