When I started training dogs over 20 years ago virtually all dogs who were in training wore cool dog show collars. Although I used cool dog show collars for many years I never use them now that I have a better and more effective set of skills. Before I tell you why, let me first explain how a cool dog show collars is used.
So there you have it, an overview of a variety of common collars and harnesses. None is perfect. They are all just tools. But some are more likely to cause problems in your pet or may just provide a less than ideal match for your needs. In case you're wondering which I prefer—ideally my dog can walk on leash with the flat collar he wears regularly. But for those dogs that tend to pull and need more work, I tend to recommend a front-attaching harness or a head collar of some sort.