Some are so intelligent that when you set them one of the Coren tests they look at you to say 'That's daft. I can't be bothered.It's an insult to my intelligence' .They therefore score poorly LOL
Coren himself , after consulting dog trainers, ranked the GSD and the poodle highest, (Below the Border collie, which nobody thinks is a dog! It's a cunning super-human disguised as a dog) First ten, in order:
Border collie; Poodle;GSD; Golden retriever; Dobermann; Shetland sheepdog; Labrador; Papillon; Rottweiler; Australian cattle dog.