There are guide dogs, and there are assistance dogs but, to help people who are blind as well as physically disabled, some dogs are trained to be both.

Tony Brown-Griffin from Kent uses her guide dog Hetty to help her get her children to and from school, to attend community events and do other day-to-day tasks. As well as being registered blind she has epilepsy and has, on average, one major seizure every week.

read more here: http://www.bbc.co.uk/news/blogs-ouch-32656599