These dog's are easy to spot because they are ordinary dogs relaxing with their families, undercover or out of a hero's costume. They wait.
Like Duke in the video link below who without any formal disaster or rescue dog training jumped into action and saved a baby's life.
WFSB Channel 3
And, Boone who jumped in front of a rattlesnake to save a boy.
Then there was a born hero in a newly adopted Chihuahua puppy who saved its new family from a fire that destroyed their mobile home. As smoke and flames spread through the residential trailer, the agitated puppy barked and growled persistently until it woke the home’s owner. When she realized the building was burning she was able to wake her children and two house guests and escort them safely outside.
There is another example of a great dog in action, this family credits their dog with saving their lives and sounding the alarm after a carbon monoxide detector goes off in their home.