I've used this training collar on my golden retriever for 2 years now and have been very happy with it. My dog Sky is now 3 years old and works great while hunting and always obeys. No issues with the collar. It is waterproof and very strong. The collar also has a sound function which is nice for when it is really windy while hunting. You can just push the sound button to get his attention. You can also expand the transmitter to control up to 3 different collars.