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updated 3:06 p.m. ET Sept. 11, 2008

NEW YORK - A fluffy little dog named Lexi is being called a hero for helping to rescue an 85-year-old neighbor who collapsed in his Brooklyn apartment.

Linda Deutsch concedes that she thought Lexi — a white bichon frise — was being naughty when she refused to get into the elevator for their walk.

Finally, though, Deutsch let Lexi lead her down the hall. That's when she heard a cry for help.

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The building superintendent was summoned, and they found Charles Postler, who had been lying helplessly on the floor for hours. He was treated at a hospital.

Comments his son, Charles Postler Jr.: "People say that dogs are man's best friend and this proves it all over again."