An early team member
By 1960, Thorn appeared beside Eisenmann and London in early television material. He also features in descriptions of demonstrations and the travelling working team.
Later recollections
Later accounts describe Thorn standing in during film work and recall a typewriter caption associated with him. They help preserve the story of a working dog, but they do not supply a complete dated record of individual credits.
Identity note
We can trace an early dog called Thorn. It is not yet clear whether every later reference to the same name is the same dog.