yea.. they sure are... we were at pet smart and once everyone got doing the "cute dog" thing they were quick to let us know about how hyper she is going to be... one guy even called her a jack russell terrorist... haha
A couple that my wife knows have one. We go to their house every year for Christmas. I played with him, throwing a chew toy and having him fetch it and bring it back. We played for two hours. He is a great dog, funny, and very intense about playing. He would never quit fighting me for the toy. I came away real impressed with the breed. They seem to be very intelligent. Great pet for kids.