(excerpt) wikipidia ( but I cant find the link anymore )
The author used “understanding of new commands” and “obey first command” as his standards of intelligence. He surveyed dog trainers and compiled this list of dog intelligence. While this method of ordering dog intelligence is acceptable for training and working with dogs, it does not apply to the genetic intelligence which can be measured by ingenuity and understanding of common situations. The drawback of this rating scale, by the author’s own admission, is that it is heavily weighted towards obedience related behavioural traits (e.g. working or guard dogs), rather than understanding or creativity (e.g. hunting dogs).
As a result, some breeds may appear lower on the list due to their stubborn or independent nature, but this nature does not make them unintelligent or impossible to train. The book includes other sections on hunting and other intelligence types, as well a general IQ for dogs that owners can perform on their dogs; that test is better weighted for ingenuity and independent problem solving, but rankings were provided only for working intelligence, and are listed below.
* 1–10 Brightest Dogs
* 11–26 Excellent Working Dogs
* 27–39 Above Average Working Dogs
* 40–54 Average Working/Obedience Intelligence
* 55–69 Fair Working/Obedience Intelligence
* 70–79 Lowest Degree of Working/Obedience Intelligence