Read the given passage and answer the following question.

At first sight, service dogs look like any other dog. They are furry. They walk on all fours. They have a tail. But they have many differences from other dogs. Service dogs are well behaved and are obedient. They wear clothing that no other dog wears such as a vest to make people aware that they are service dogs. Service dogs are unlike other dogs because they are trained to do tasks that human beings normally do, but can’t because of some disability. Service dogs help their owners navigate the world they live in by assisting their owners in overcoming day to day.
After a dog is selected as being a potential service dog, it leaves its mother and goes to a family for training. During this time, the puppy is exposed to as many environments and situations as possible, such as cars, children and restaurants, since it will be going everywhere with its owner. Service dogs attend obedience school and learn simple commands, such as stay, sit, and walk.
Once a puppy dog being trained as a service dog reaches eighteen to twenty months, they leave their training family and are brought to the training organization for further training along with other service dogs. During their training time they learn fifty plus commands. They are trained to perform tasks that are difficult and uncomfortable such as crawling along the floor so that they can get under furniture to retrieve items that their owners may have dropped. The dogs must be strong in case they need to push or pull a wheel chair through a narrow area. At the end of training, they are given difficult tests to test their shyness and submissiveness. If they pass all their tests, they go through a boot camp where their potential owners are trained how to take care of them.