Crossword Genius

The ____ is often called the most intelligent breed of dog (6,6)

Ross

I believe the answer is:

border collie

(Other definitions for border collie that I've seen before include "Working sheepdog" , "Type of sheepdog" , "Sheepdog breed" , "Dog commonly used for herding sheep" .)

I've seen this clue in The Times and The Sunday Times.
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