Conversation so far:
what is will smith's dogs name in i am legend
Will Smith's Robert Neville's only companions are his German Shepherd, Samantha and some mannequins he regularly “talks” with.
What films besides I Am Legend star a German Shepherd?
Rin Tin Tin was a male German Shepherd that was an international star in silent motion pictures.
How many films did Rin Tin Tin star in?
Rin Tin Tin was an immediate box-office success and went on to appear in 27 Hollywood films, gaining worldwide fame.

Question: Where did the dog come from?
Self-contained rewrite: Where did Rin Tin Tin come from?