I have an border collie aussie shepard mix. Intellegent and fun dog
Our shnauser was dumber than a box of rocks.
OUr yorkie was another people, except brighter than most.
Our standard cockerspanials ...this was forty years ago, were so intelligent they were known in the county.
My sister has a dog as dumb as rocks - 100 lbs of love, unadulterated by intelligence. But he is still such a delight to be around!