Charlie is very smart and very fun. He is also the biggest trouble maker I have ever had the honor of calling my puppy. He loves to rip open stuffed toys to get the stuffing out, find ways to get on the kitchen table, and hit the buttons on the TV to turn it on/off. Most of the time, when we command "sit" or "down" he will follow-up by rolling over once he is done. He is apparently quite proud of that particular trick. We got him at the Humane Society when we went to look for a cat. Thank goodness we changed our minds. I can't imagine not having him in my life.