Overall a great idea but the design definitely needs an overhaul. My dog liked it! She is a hunting dog and chases them like crazy, but it didn't last long at all. The weasel attaches just through a hole on the ball with a plastic tag, much like you would find a price tag on a piece of clothing. tug and it slips through the hole and off. The weasel is small, so your pet could choke at this point, which is why it had to be thrown in the trash. I wasn't a fan of how to turn it on and off either. You need to halve the ball to open and flip the battery cover over to make contact with the battery and then it will work. To turn it off, open and unfold the battery cover. ENSURE it is in the up position when it is off or you have removed the battery completely as the ball will open slightly giving your pet full access to the loose battery which is fatal and very painful if it does swallowed him!