K9 officer dogs are used by police departments worldwide. These dogs can be all different breeds such as German Shepherds or Labradors. The dogs are trained for months before they are paired up with a police officer partner to work the streets. These dogs are extremely well behaved and only take commands from their officer partner. The dogs can be trained to do things like sniff out the trail of a criminal who has run away or the source of a fire. It is very important if you see a dog to remember that it is working and not to pet the dog without permission from the officer.