i think it has more to do with the particular dog, and his lineage, than his color. i also think that like horses or any other animal that may have "color", to many people have bred for looks and not enough for ability.
I absolutely agree..
These days It's all about "double glass eyes" instead of performance and the main thing a dog has got to have, WANT TO..
Yep,
If somebody rings me wanting to buy or inquire about a pup/dog, if (requested) "Glass eye" or spotted coat is mentioned in the first couple of minutes - my response is - sorry i have nothing available at this time!
Wrong reason for wanting a dog IMO.........
