The Kennel Club recognizes twelve breeds of dog as being Scottish:
Dandie Dinmont Terrier
Rough Collie and Smooth Collie
West Highland White Terrier
Got that from this page.
I have a secret yen to get a Westie and name him "Mad Jack McMad, winner of the All Scotland Madman Contest," after the character referred to briefly in the "Duel and Duality" episode of Blackadder the Third:
Blackadder: He's mad! He's mad. He's madder than Mad Jack McMad, the winner of this year's Mr Madman competition.