I recently got a new rescue who is beyond stubborn. A trainer recommended a collar such as this and when I saw that it has various different levels and also had different options for getting the dogs attention, I realized this would be a great purchase. It is considerably less expensive than the one the trainer was trying to sell me, but works just the same. Perhaps it works even better because I have it on the absolute lowest vibrate only setting and it works wonderful. Nothing more is needed and I have plenty of additional room to increase things if that should change or if I end up with another dog that would also benefit from this collar but is even more stubborn than the current one I have. Considering that I keep saying no more pets and then ending up with yet another, it is very likely that I will be adding to the family. Either way - the collar is great for my current dog and I'm sure it will be great for any future dog that may also need it.