For some bigger dogs they can be a good training tool- but you can't just throw it on and use it- you need to train with them and also follow the directions and attach a leash to a collar also. I do not like them with small dogs because the dogs neck gets pulled up because you are so far above them. You might be better off joining a local obedience class, or reading up on ways to train a dog not to pull. Then you can use a harness and have the dog right next to you.
One method I use to help not pulling is to bring treats or a meal (if you feed kibble) with you on your walks. As you are walking randomly say your dogs name (or whatever you use to get their attention) and toss them a treat. Once they are really looking at you and waiting for it to happen do the same thing but as you say it start backing up so the dog really has to run for you and when they catch you give a treat. Eventually you will only be doing this once or twice on a walk but it creates a dog that is very interested in YOU on a walk. They also will be easy to redirect because as soon as they see something you think they might pull for just call their name and they will be totally into you.
Unfortunately because of their size and fragile trachea a lot of the tools that are great for training bigger dogs are actually unsafe for chis. Actually it might be a fortunate thing because it makes us train them right!
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