There was an article this week in the UK newspapers saying that the smartest breed of dog is the Border Collie. (The cheer of agreement you can hear is Auntie Breeze and Dare)
However I think it depends on how exactly you measure intelligence.
This is Chip and as a Terrier his breed doesn't rate very highly on the newspaper list.
However to think of lying in the shade of clothes on the garden washing line, whilst the rest of us sit in the Sun, I think is a very clever for a dog...