Dusty, the wonder dog

When Mary was a kid, her parents bought her a four-month old german shepherd. Dusty doubled as a school crossing guide who would walked the kids to school. Of all the contribution Dusty made to their family, one incidents stands out far and above all others. Late one night, dusty rushed to Mary bedroom, she barked and barked again and again. Finally mary's mom woke up. Mum followed dusty and realise that the house near theirs were on fire. Her mother alerted the fire department immediatly. Soon the fireman put down the fire and saved the people,preventing their house form total ruin. Her mother refused to take credits and said that it was dusty who saved them.