They say a dog is man's best friend and what do best friends do? They always look out for each other, and this dog did in a big way!

A Wisconsin family is calling their dog a hero after she saved their lives by altering them to a dangerous and potentially deadly gas leak.

The Siekert family was feeling pretty rotten. They were lightheaded and dizzy and thought they all had the flu. Except they didn't have the flu. Their furnace was having issues and potentially deadly gas was leaking into their house.

Their dog Abby, an Australian Shepherd-Border Collie knew something was very wrong. She nudged and pawed at her owner Nicole, going so far as to take Nicole’s head and try to lift it up with her snout. Abby's nudging was enough to get Nicole to follow her to the basement where she discovered the carbon monoxide detector was going off and was able to get her family to safety.

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