I've never seen Teddy do anything really dumb, but he doesn't know how to open doors or anything. I think he's pretty normal. I would say his strongest trait is that he is extremely emotionally attached to my mom. She can be out in the garden, and he will be standing on the back of the couch looking out the window, and crying like she's never coming back, even if he can see her.
But at the same time, he always gets so excited when we come home!