Kennedy knows all too well that shelters often go above and beyond to reunite missing dogs with their families, and can imagine the toll a tragic mistake like this one might take.
"The worst thing for someone working in animal welfare is to feel like you didn't do enough to get that dog home," she said.
Cowgirl, a 3-year-old Lab, was mistakenly euthanized in a Florida shelter in 2013 because of a clerical error: a missing arrow on her papers that should have indicated she had been claimed.
Her devastated owner, Danielle Riggens, who was set to pick her up the next day, told USA Today, "The director got on the phone and said, 'Danielle, I'm so sorry, but your dog was accidentally euthanized this afternoon.' I said, 'You've got to be kidding me. That's not my dog. That's not my dog.'"
Riggens vowed to campaign to make it harder for mistakes like this one to happen, but clearly, as Sadie's story shows all too well, misunderstandings can mean the difference between life or death in a shelter.
See more of Sadie's story below: