Adopted Dog Pays Owners Back by Saving Baby

Parents find child not breathing after dog jumps into bed to wake them.
3:00 | 10/13/12

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Transcript for Adopted Dog Pays Owners Back by Saving Baby
Now, to the story of a rescued dog and an extremely ul family. A family adopted a dog named duke. And he paid them back. Duke is an ordinary-loong dog that did something extraordinary. Last sunday night, duke jumped on his owner's bed, and started shaking uncontrollably, he woke them up. He is insanely obedient. This was bizarre. Reporter: So bizarre, that janet russo knew something was wrong. This prompted her and their husband to check on their 9-week-oldant daughter, harper. Sure enough, something was wrong. Harper wasn't breathing. My husband called 911. And the ambulance came here. And it was because of our dukey dog, who alerted us. Reporter: Duke's call for help saved the little girl. Harper is now doing just fine. If duke hadn't, you know, been so scared, we would have just gone to sleep. Reporter: They adopted him six years ago. A debt of gratitude that's been repaid times over. He was meant to be ours. I tell him all the time, you were born in mommy's heart. Just because he was so meant to be ours. He's a good boy. He is a good boy. So cute. So cute. And the they hope this story will encourage more pets. There's three people I know, I'm not going to mention their names. But there's three people who have not adopted pets. I'm dealing with a 6-month-old. But you know what? Could be the best investment to make. Coming up here on "good morning america," shots fired. Police search for a gunman who opened fire at a campaign office

This transcript has been automatically generated and may not be 100% accurate.

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