Does anyone use one on their small dog ~ 20lbs? We have the system and collars for our bigger dogs (and really like it) but now have a little one that needs to stay in the fence. They don't apparently have lighter collars for smaller dogs.
All I can tell you is that we sell them at work and never have them returned. We live in a small town and probably sell one every two weeks or so; no returns, no complaints in my experience. But I've never used one myself so that experience is limited!