All police dogs must first become experts at basic obedience training. They must obey the commands of their handler without hesitation. This is what keeps the inherent aggression of the dog in check, and allows the officer to control how much force the dog is using against a suspect.
A police dog must also make it through endurance and agility training. The dog must be able to jump over walls and climb stairs. Each dog is acclimated to city life, because a dog that’s nervous around people won’t make a good police dog.
Finally, each dog receives specialty training. Many dogs are trained to search for drugs, though some are bomb or gun sniffers. Police dogs can also track missing persons or suspects.