My Thumper looks just like yours but my Thumpers ears were lopped.
This is Thumper now
http://i3.photobucket.com/albums/y55...fyThumper2.jpg
This is Thumper when she was 2 months old.
http://i3.photobucket.com/albums/y55...Apparently.jpg
she used to chew up the coroplast and she would be like yours can't sit still, wants out all the time and don't like to be held too long.