1.   After the hounds find the scent, everyone takes off at once.

2.   When the dog is rewarded for finding the ball, he learns to associate finding the scent with positive reinforcement.

3.   Aritonang said a police dog used at the scene had found a scent which led the officers to Rohimin.

4.   However, by Thursday night police dogs were no longer finding the scent of anyone trapped beneath the debris.

5.   Police dogs found no scent of the boy outside the car.