Chapter 23 THE POLICE DOG

Dillon pulled a whistle from his pocket and blew a short blast sharply. Far down the road, we could hear faintly an answering bark. It came nearer.

"They're taught to obey a police whistle and nothing else," remarked Dillon, with satisfaction. "I wonder which one of the dogs that was. By the way, just keep out of sight as much as you can-get bac