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No, as of 2014, a Doberman has never won Crufts.
No, only purebreeds are allowed to enter in Crufts. However, there is a Crufts offshoot called Scruffts, which is a show specifically for crossbreeds.
Crufts was founded by a man called Charles Cruft in 1891.
Yes, a Scottish Terrier won Crufts in the year 1929.
The show was originally created by a man named Charles Cruft, so the show is named after him.