Ray Allen Manufacturing features choke chain dog collars from Herm-Sprenger. Sprenger is the preferred brand for dog choke chains by professional police and military K9 handlers. Herm-Sprenger dog choke chains are offered in a variety of finishes including stainless steel choke chains, chrome-plated choke chains, black and matte. Herm-Sprenger choke dog collars also feature styles with or without a toggle or martingale.