I've had some smart ones, but the dumbest was a lab. He was also the most expensive purebred, high dollar blood lines, champion field trial parents and all. He'd retrieve singles, and even doubles at his own pace, and it was never fast. Turd eating extraordinaire no matter how expensive the dog food, how many vitamins, or what I sprinkled on it. Our bird dog became a better retrieve just by being out in the field with him.
We've got two purbred German shepherds now, one is our sons who's deployed, and a shepherd / McNabb mix. The mutt is every bit as good a dog to have around as the others, and she kills rodents frequently.
