Mr. Bill is my dog's favorite toy, hands down. In that regard I would have rated him highly. HOWEVER today we had a major incident. My dog finally decided to rip him apart. He was playing with it, it was making its signature "Oh no!" noise... and then it wasn't. I heard a crunch, looked down, and my dog had the noise box in his mouth. The door was completely off the battery compartment and 2 of the noted 3 button/watch batteries were on the floor next to him. So here we are at the emergency vet inducing vomiting to save him. It looks like there should have been a screw on the door to the battery compartment. I wasn't able to find that either so I don't know if he ate that too or if it wasn't there. It certainly shouldn't have come off that easily. Please, if you have this toy, be very cautious. Remove it from your pet immediately if it becomes damaged. Maybe even open it to check for a screw on the battery compartment door. Batteries can kill pets.