Zach Hackett was up 12,000 feet hiking on a mountain in Colorado when he heard a faint yip from a dog.
As he walked through a clearing, he spotted a black and white Shetland sheepdog, visibly shivering behind some fallen pine trees.
"I was a little startled, because dogs shouldn't be up there so high," said Hackett, 33, who had been hiking all day and was about four miles from his apartment in Breckenridge.
"Hey buddy," he called out. "Are you shivering cold, buddy? Can you come with me? Can you follow me?"
As he drew closer that day, May 14, Hackett realized the dog was too weak to move. It was about 45 degrees out — though the temperature dipped below freezing at night — and the dog looked like it was near death.
"I believe what I'd heard was his last cry for help, and that if I hadn't come along, he would have died there," Hackett said. "I knew I was going to have to carry him down the mountain."
About five weeks earlier, on April 8, a mile from where Hackett lives, Mike Krugman had let his dog, Riley, out for a predinner walk on his 36-acre property.
"I got his kibble ready, and when he didn't come back, I didn't worry at first," Krugman said. "Sometimes Riley likes to go down to the barn and bark at the horses."