Ten most and least intelligent dog breeds

Most Intelligent –
These breeds on average require less than 5 repetitions to understand a new command. They obey first commands 95 % of the time or better.

With #1 being the most intelligent
# 1) Border collie
# 2) Poodle
# 3) German shepherd
# 4) Golden retriever
# 5) Doberman pinscher
# 6) Shetland sheepdog
# 7) Labrador retriever
# 8) Papillon
# 9) Rottweiler
# 10) Australian cattle dog

Least Intelligent –
Require more than 80 repetitions to understand a new command. Obey first commands less than 25 % of the time.

With the least intelligent breed at number 10
# 10) Afghan houndAfghan
# 9) Basenji
# 8) Bulldog
# 7) Chow chow
# 6) Borzoi
# 5) Bloodhound
# 4) Pekingese
# 3) Mastiff
# 2) Basset hound
# 1) Shih tzu

(via)