Cici, a chocolate labrador （拉布拉多犬）, guides her trainer walking across the street. Her trainer says, "Right." Cici makes a 90-degree turn. She notices a little bird under a tree. Her trainer pulls her back and Cici goes back to work. Her trainer gives her a piece of dog food.
Cici is being trained to be a guide dog. Guide dogs help people who are blind or disabled. It can take up to two years for a puppy（幼犬） to become a guide dog.
So how do trainers make sure their dogs are the right ones for the work? Jim Alloway heads Pilot Dogs in Columbus, Ohio. He and his team test the puppies before starting to train them. He says, "We don't want to waste our time on a dog that won't be happy to be a guide dog and won't be safe for their owner." In one of the tests, trainers drop a box on the floor near the puppies. Do the puppies ignore（忽略） the noise? Do they run away? More than half of all dogs tested fail. They end up doing some other service work or become family pets.
Once a puppy passes the tests, trainers begin teaching the dog basic orders like "come" and "sit". It's not easy. Puppies are still babies and they get tired. They don't always follow the rules. To teach a dog to come when it's called, trainers wait until the dog is already standing in front of them. Each time the trainer says "come", the dog gets a piece of dog food. It takes months of practice to teach a puppy to follow the order.
After practicing inside, ____. The dogs learn to guide their human partners down sidewalks and around people. They learn how to cross streets safely and how to get onto buses. They learn to keep away from danger and ignore people who want to pet them.
