It looked a little bunched up in front, like there was some kind of device there.
Yes, a bark collar controls barking. Not necessarily "too loud", but more like non-stop, or barking beyond a certain point. Some work by touching the dog physically and some work by spraying attention getters, like citronella.
I hear Poms are known for barking at nothing inparticular and that's why I asked. Plus it looked like one