Our dogs used to be very smart. One always refused to pass a graveyard near my old home - there was also a Saxon graveyard there from over 1000 years ago. Weird or what ? Another dog used to sleep when my parents drove from their house to mine (about 5 hours) and then suddenly awaken and sit up when they reached the traffic lights turning into the road I lived on. This dog also made a fuss when my parents once drove to see their friend and passed (without turning off) the usual mororway junction (about 2 hours from their home)that led to my house. The dog obviously thought my parents had taken the wrong turn !! My hamster used to push open doors by standing on his hind legs and pushing a door ajar with his front paws. One day when I had closed the door tight he tried to open it by walking along the width of the door (on his hind legs)trying to push it and looking at me as if to say "Why isn't it opening ?". He also understood the word "NO" and wouldn't do anything if I said NO to him. Another hamster wouldn't go to sleep unless I spoke to her every morning. She would stay awake until I said "hello" to her in the morning (as they sleep in the day). She would also squeak when she climbed to the top of the cage for me to put my hand underneath her so she could drop into the palm of my hand (rather than climb down herself) !! Once she also squeaked loudly when she was in her plastic ball running around the living room and saw the other hamster escaping from his ball. She knew he wasn't allowed out and tried to let me know.