 When the puppy is between 12 and 15 months of age, the puppy will then return to The Seeing Eye for formal guide dog training.Once the dogs return for formal training, they first go through health screenings and then are assigned to an instructor.The formal training may take 4 to 6 months, during which time the puppy raiser will receive a postcard from the instructor with an update on how the dog is doing and towards the end will be invited to attend a town walk.