As a Certified Professional Dog Trainer, I am rendered speechless at the thought of this inhumane product being offered on the market.One of the many problems I see with the product, is that how easily it could cause a dog to become fearful or even aggressive. It is impossible to predict what the dog might associate the shock with and consequently become aggressive or fearful. Perhaps it's the child in the room or another beloved pet.I don't even want to think about the torture that the use and misuse of this product could subject dogs to.Let's give dogs credit for being intelligent creatures. A down stay is not hard to teach. It's not the dogs here who lack intelligence. Please take this product off the market.