Red * Size 5 is recommended for the following breeds: bloodhound, large danes, mastiffs, St. Bernard, and similarly sized dogs. * Does not include retail packaging, these are bulk and have a tag with the UPC * Stops your dog from pulling-when the dog lunges forward the slip ring closes the jaw, when the dog is relaxed he can pant easily * Works on the principle that where a dog"s head goes his body will follow