Teacup and Toy dog breeds are notorious for pulling their owners along while on their daily walks.
This subborn, headstrong behaviour can be especially harmful in smaller dogs because of the undue stress that a collar can apply to the dog's trachea.
A potential problem may be indicated if your dog chokes and coughs while pulling on the collar.
To avoid damage to your dog's trachea, use this Puppia harness that puts the stress of your dog's pulling on the chest instead of the throat and soft around the neck and chest.