NBCNews.com


High-tech heart surgery helps dogs live a longer life
NBCNews.com
When Mark and Amy Hefestay rescued Misty two years ago, they immediately fell in love. Misty, a Great Pyrenees mix, was special not only for her sloppy kisses but also because she was born with a heart defect. Misty the dog MistyLauren Dunn / NBC News.







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