Some Dogs are Simple

I have two Border Terriers: Oscar and Hunter. I adore them, and the feeling is mutual. They're cute, funny, sweet, loyal(ish), and...one of them is smart! The other one? Not so much. Which is why I looove this hysterical Hyperbole and a Half post about what it's like to have a simple dog. 
Do you have pets? Are they brainiacs, or...simple?