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Puppy raisers generally receive their wards at about 8 weeks of age and return them to the guide dog center at around 14 months for formal training.
Typically the actual working part of a dogs training takes between 3 and 9 months - after the puppy stage and "being a good pet" training is finished. This is why many organizations use volunteer puppy raisers - it helps get their dogs through the basics with very little expense (most training organizations run on donations alone). Other groups scour rescues and adopt adult dogs who have already gone through the puppy stage... and yet others place their dogs in their future homes as puppies to help the bonding process along.