US mum dies after ‘sacrificing herself’ to save her son from dog attack involving the family’s pitbull

A US mother who had both arms ripped apart while trying to save her four-year-old son during a dog attack has died.

Heather Pingel, 35, from Wisconsin, was attacked by her family’s pitbull at her home in Bowler, near Milwaukee, on December 8, the Wausau Daily Herald reports.

The boy’s father,…