Dog Saves Neighborhood from Potentially Explosive Gas Leak

A dog in Philadelphia kept digging holes in his owner's yard, and his owner didn't know why.  Turned out there was an underground GAS LEAK that could have caused a huge explosion.  It took workers three days to fix it.  They say if the dog hadn't found the leak, the woman's whole house could have blown up.  Maybe her neighbors' houses too.  (Here's a video she posted about it.)