Transcript for 7-year-old dog found after 57 heartbreaking days
Finally tonight, a couple and their dog separated for more than 50 days. That couple never giving up hope they would find their sweet going above and beyond. Tonight, the moment they thought would never come. Carol and Verne king live in Washington state. They love to visit Montana, especially with their dog Katie. But one night, a thunderstorm rolled in, and Katie somehow rolled out. I raced downstairs and talked with the hotel clerk in hopes they had my dog, but they didn't. Reporter: For more than 50 agonizing days, the kings looked everywhere, in very rugged terrain. Checking water holes for paw prints. Even looking in abandoned buildings. We knew she was roaming at nighttime. We purchased night vision goggles in the hopes we would see her. Reporter: They ran classified ads, and put up posters. But Katie never turned up. When things turned really dire, Carol quit her job. Deciding to search full-time. Her husband Verne leaving this note behind when he had to return home. Writing, I would rather say see you soon than saying good-bye. They were on the brink of losing hope when finally a tip came in. I look, and Katie comes out of the trees. After we found her, it was tears, it was everybody high-fiving. It was just sheer joy. Reporter: And this is the moment Katie sees home. There they are! Reporter: And Verne sees his girl. Oh! My little girl. Reporter: For the couple that never gave up hope, and the dog that somehow survived, after more 50 long days, it's time to catch up. Thank you for watching. I'm Tom llamas in New York. "Gma" first thing in the morning. David is right back here tomorrow night. Have a great evening. Good night.
This transcript has been automatically generated and may not be 100% accurate.