A dog may repeat an examination, but must first turn in his current certificate. If he fails, he again becomes an uncertified dog. Repeat certification attempts are unusual, but sometimes a handler feels that his dog is better than the first score and is willing to take the risk. The Police Dog One examination has a water exercise where the dog must swim across a canal on command and return on command. There is also a large object retrieve.
Obedience is much less precise but more demanding than other sports.
The dog must heel on and off leash and beside a bicycle. The protection exercises include a guard of object, object search in the woods, a person search in the woods, transport of prisoners. There is a long attack in which the dog is struck with a long stick before the bite, a call back from a long attack, an attack against the gun and a long attack to stop a person fleeing on a bicycle. Every year in the months of May, July and October, the KNPV puts on certification tests. The Head Board of the KNPV and the board of each province organize these certifications.