My experience for smarts has been Shelties and Bostons.
I have been looking for a Boston for three years. Found one I wanted for $1000.00, and the owner raised the price to $2700.00 with retention of 1/2 ownership. Naturally, though heart broken, I refused. Want a well marked black and white with a black nose. Any ideas?
I think she should have gotten a Doberman -- specifically one with its ears and tail intact. Just as adorable as a Lab. And considerably more intelligent. But, then, I may be a bit biased after nine wonderful years under Baron's tuteledge.