Military working dog Riki receives a sedative prior to receiving an injection of euthanasia solution at the veterinary treatment facility on Joint Base Pearl Harbor-Hickam, Hawaii, March 2, 2017. After six-years of service, Riki was euthanized due to progressive incurable illness. ( Air Force photo by Tech. Sgt. Heather Redman)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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