I have a 5 yr old purebred German Sheppard named Duke and not that I'm biased or anything but he is very smart. At 6mths old took him to his first night of dog obedience not realising it was grading night....he passed grade one without any training! Passed grade two after four nights. never passed grade three, which is all off-lead, he'd do the whole grading perfectly until the very end then because he knew we were fininshed he'd start playing and running around....fail! He used to take the kids their hats when they were playing in the sandpit, he has rescued my blind and senile Silky Terrrier from our pool twice, and when I was fundraising for De Veer he did something very naughty but kinda funny....he opened the back door and came into the kitchen and carefully caried a box of fundraising Freddos outside and proceeded to open every single one and lick every scrap of chocolate from the wrappers! His snack cost me $48!!!!!! But he is a wonderful friend!