"This product is obviously designed for a large dog as it's too cumbersome for my dog to wear. It is like a brick in comparison to my dog's body and he's not a toy dog either. Also, it doesn't seem to work or shows no sign of activation. There is no way of telling if it's on or not. It's about as useful as strapping a large bit of plastic to my dog's neck and praying for the best! Not one of my wisest purchases but then again perhaps that's just me. However, personally I wouldn't recommend it."