The unsual sights and sounds of Wookey Hole help the dogs get used to strange surroundings.
Carly Watson says guide dogs gave both her and her mother independence.
Her daughter says Isabel Holdsworth faces a choice between regular family visits and a guide dog.
Kevin Rafferty says Dexter alerts him to noise and has been a companion since the death of his wife.
Support dogs can help calm autistic people, monitor blood sugar and help with mobility.
Guide Dogs is opening its training centre in Woodford Green to showcase the charity's work.
A labrador that alerted its owner to thousands of medical episodes is honoured for its service.
Lee Roberts says guide dog Isha changed his life after an infection caused him to lose his sight.
