Canine units are utilized in all aspects of law enforcement and in the military. They are often referred to as k-9 units which is a homophone of canine. These units use dogs that are specifically bred and trained to do jobs. German Shepherds are the common breed used in canine units. Belgian Malinois are another popular breed. Dutch Shepherds, Rottweilers, Boxers, Doberman Pinschers, Giant Schnauzers, American Pit Bull Terriers, and American Staffordshire Terriers have also been used in many canine units but are not as common. Their jobs can include but are not limited to attack dogs, search and rescue dogs, detection dogs (bombs, drugs, ect….), arson dogs, and cadaver sniffing dogs. Dogs are amazingly useful tools in law enforcement. Training dogs for law enforcement has been recorded all the way back to the middle ages. Now there are schools designed just to train dogs for their specific duties. When a service dog is chosen it is not always chosen by the handler but it should be. The handler watches a litter of puppies for the first few weeks of their lives and picks the puppy that is most secure and confident. At first the puppy is trained like any other puppy with obedience and litter training. But the puppy is slowly introduced to things like noise for instance. An attack dog needs to be used to gun shots. Their handler must gradually get the puppy used to louder and louder noises until the dog is not fazed by gunshots. A service dog normally starts their training at about six weeks old. Consistency is very important when training a dog. The same trainer should be used for the entire career of a dog. That way the dog and handler for a bond and the dog will understand what his trainer wants from him and look to his trainer for approval. Airscenting is how search and rescue dogs find people who are lost or in a disaster situation. They use the human scent