The ULTRA-PLUS Micro training collar is made with small dogs in mind. Made with 1.5mm stainless steel, swivel added for ease of movemment. Fits up to a 9.5" neck. Individual links can be added or removed for a better fit (sold separately.)
One one the most well known names in dog training. Herm Sprenger products are extremely durable. Most trainers recommend these for a safer alternative to choke collars. If placed properly this collar will not apply pressure to the trachea.