First he let his dogs smell it,then

First he let his dogs smell it,then he followed them.
After a time the scent took them to a cottage several miles away.
in the yard behind the cottage stood an old car:its engine was still hot.
the dogs had followed the scent of the murderer even though he had traveled in a car! the bloodhounds scratched with their paws at the door of the cottage until a woman opened it.