- The Guide Dogs for the Blind Association
- United Kingdom ()
In terms of the number of dogs trained, the world's largest assistance dog organisation is The Guide Dogs for the Blind Association (aka Guide Dogs), with its head office in Hillfields, Berkshire, UK. As of 31 December 2016, Guide Dogs had successfully trained 33,910 dogs to provide mobility assistance to blind or partially sighted people.
The charity was founded in 1934. At the end of 2014, the organisation had 1,368 members of staff.