I've got an English Staffy x Belgian Shepherd. He's the smartest dumbshit I know.
He knows who I don't like. How to shake hands, high five... Or rather high ten. And get your >insert whatever toy he hasn't yet obliterated here<.
But at the same time- he falls over his feet just walking along. Constantly turns into walls, poles, doors... you name it. If it's head height. He's probably walked into it at least once. Yet he's not blind. Just spacially unaware.
He's that much of a derp. I watched him roll off the bed, hit the floor. And just be like- Meh, here's good. He didn't even lift his head. He just hit the deck and proceeded to go back to sleep.