Read the following text and summarize in a sequencing format text structure: How long does it take to train a dog? When the dog is about eight weeks old, it’s placed in the home of a volunteer puppy-raiser, where it’s taught basic obedience and socialization and given lots of love. When it’s about 18 months old, the dog returns to The Seeing Eye and begins a four-month course of training with a sighted instructor. When the dog passes this phase, it’s matched with a blind person. The person and the dog then train together, under the supervision of a sighted instructor. Someone training with his or her first dog participates in a 27-day training session. For someone training with a second or subsequent dog, the session lasts 20 days.