The term “man's best friend” comes from the domestication of canines in ancient history. Studies have shown that these four-legged creatures were domesticated over 33,000 years ago. Starting from the wolf, today there are over 400 different types of breeds. Dogs were initially used as helpers. People would have used them for jobs such as hunting and herding. As time went on, people began to use them more for help and protection. The US Army was the first to start the use of K9 units in 1835. Europe, Belgium, Germany and Hungary realized the potential of these canines and adopted the idea in the late 1800s. Already in 1911 only Germany counted over 400 police stations equipped with K9 units. There are now over 22,000 dogs used in law enforcement. Bloodhounds, known for their idea; sense of smell, was the first breed used for policing in Europe. It was 1888, when Jack the Ripper was at large. The famous German Shepherd made its debut in Germany during the Holocaust by the Nazis to control prisoners. At the time, they were used less for protection and more for attacks. With proper training the dogs are now considered legitimate police officers. Each state offers its own K9 training academy. On average, all training academies begin the training process when the dog is still considered a puppy. It's about 12-15 months. It is possible, but very difficult to train him at a young age due to the puppy's lack of concentration and maturity. The first step in the training process is basic obedience. This is the time when the puppy learns basic commands, such as sit, stay, come and down. Depending on the academy, the training part lasts approximately 6-8 weeks. Some dogs are trained in Europe and then taken to University... middle of paper... canine police discovered a shipment of marijuana in heat-sealed Mylar bags, inside plastic crates, sealed with foam sealant , inside a garage'. This shows how thorough and vigorous these parts of the training are. Once the dog finds the hiding place, there are two types of alerts the dog can send to inform the handler. The first type is an aggressive warning. This is where the dog barks or scratches at the location of the medications. The second type of alert is a passive alert. This is where the dog would sit when they found the location. In some cases, an aggressive alarm would be dangerous, so they teach the dog a softer approach. Canines are taught to give both aggressive and passive alarms when the time is appropriate. Once all the training is complete, the dog is finally allowed to join its handler in the patrol car.