That list is RIGGED..our Pomeranian mix Nemo is super smart and so is his brother Maxie(Shih Tzu)
The smartest dog I ever owned was a mutt. Had mixed everything in him.
You could tell him to go get his leash and he would! We did not train him! Tell him to go get a certain toy and he’d get it! Football, baseball, tennis ball, he knew the difference, and again we did not train him to do it...................