[Belle Noir]

I use a collar. I don't worry about trachea collapse, because my dogs don't pull on on walks. I just think it's a matter of training. Dogs trained to heel don't pull. After all, when was the last time you saw show dogs on a harness?
In my experience with other breeds, granted all larger, harnesses encourage pulling. Since the dogs have been trained since day one that forging is not allowed or acceptable, harnesses are not needed for walking. Though I confess, I am going to have a weight pull harness made for Sabre, because I think when I go to shows, everyone would get a kick out of this tiny little dog on a pull.
I do put them in harnesses when I have them tethered, because they will go up to greet people and pull against the leash, so it's better for them to not have any weight on their throats at that time.

I am mindful of a recent member who was only able to save her dog from being stolen, because her dog was on a harness, and so she wasn't afraid to pull back hard when the guy swooped down and tried to snatch her dog. But I am none too certain that would be enough for me to decide to use harnesses all the time