The touching role of the service dog is explored in this "Nova" episode. Canine Assistants founder Jennifer Arnold is on hand to share her expert training techniques and the ways in which people with disabilities are matched up with animals appropriate to their special needs. This documentary provides a unique look at the heartwarming bonds that can be forged between people and their dogs. 60 min. Widescreen (Enhanced); Soundtrack: English Dolby Digital stereo.