In this Thursday, March 29, 2018, photograph, Aspen, a 12-year-old golden retriever/Australian Shepherd mix, is shown running outside the dog's home in Brackenridge, Colo. Aspen's owners have been treating the dog with cannabidiol after the dog was diagnosed with bone cancer and had a leg amputated more than a year ago. (Hugh Carey/Summit Daily via AP)
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