Training collar - I like the Bousonic training collar. There are three harmless modes for training your dog. I usually only need the tone. It is loud enough to catch your dogs attention to help them refocus. The next level is vibration. It also is an effective way to get your dogs attention to refocus. The last is shock mode. It is there if needed but most likely won't need to be used. There are 16 different levels so you can adjust how much of a shock to use if needed.