I bought this to help in training my almost 8 month old golden retriever. It has been wonderful! I mainly use it to keep her from chewing on my family members and me. She is still in the puppy biting stage, but all I have to do is use the beeper feature and she stops. I only use the shock feature for big infractions such as getting after the Christmas tree. It's been a life changer as far as dealing with Sophie's puppy biting.