In this Monday, Oct. 30, 2017, photo, Luke Byerly guides his 14-year-old beagle, Robbie, as the dog eats his food treated with CBD oil during a break at Byerly's job as a technician at a veterinary clinic in east Denver. People anxious to relieve suffering in their pets are increasingly turning to oils and powders that contain CBDs, a non-psychoactive component of marijuana. (AP Photo/David Zalubowski)