Thanks for all your responses. While there doesn’t seem to be a consenus, it is obvious to me that color is not a factor. This is the email I received from the owner of this website: http://www.blueknightlabs.com/
If you look at the site I think you will agree this person knows what she is talking about and what she says makes perfect sense. Even a yahoo/google search on her name shows she has raised many Champions.
Although, I mainly was reasearching for my own knowledge because no amount of proof will convince some people. i.e “don’t confuse me with the facts”. I suppose this thread can be locked or moved to Great Debates (although “great” it doesn’t seem to me to be)
the email:
Keith,
Once upon a time, Chocolate Labs were the bastard child of the breed. Therefore, the gene pool was rather narrow. The dogs of that color tended to be rather busy by nature, and we joked about their lack of attention span, and referred to their antics as being the result of “Brown Brains”. It was, more likely, due to the inherited temperaments of those limited gene pools. That was a LONG time ago. Now, the gene pool for chocolates is vast indeed – and blacks and chocolates come out of the same litters, and have the same intelligence and temperaments as their ‘other’ color littermates. Yellows are no different. I do not believe there has ever been a scientific study linking coat color and gray matter, therefore, you are dealing with breeder urban legend.
I laugh to think that one could really believe that if there was a litter of all three colors, that only the coat color would determine the intelligence of the dogs in that litter. If that were so, one would never want a black who carried chocolate, for fear that the chocolate factor would produce a dingy black, or that lazy yellow gene would cause the dog to be a couch potato… God forbid the black puppy carried all three colors, because it would be one lazy/dumb black indeed <G>.
I rather liken the reference to intelligence being linked to coat color, as the same as we have in humans… we’ve all heard of dumb blonds, fiery red-heads, and smart brunettes… however, we all know stupid brunettes, smart blonds, and calm red-heads. Hair color and brain cells are not related to the best of my knowledge. Temperament and intelligence are inherited, and often folks stick to a color preference in their dogs. Those
breeders center on a specific color, will find that the temperament and intelligence of their lines, will be passed on to the dogs of that color, however, the color in itself, is not a part of the IQ.
I own all three colors. I have some blacks who are as dumb as a brick, some who are as smart as a whip, and I have chocolates and yellows that fit into the same categories. That being said, we STILL joke about brown brains, just as we enjoy telling blond jokes.

Dian Welle
Blue Knight Labradors