I have two 3 months and 12 days old German shepards. Its the hardest of any dog I have ever seen. I put there collars on them and in 15mins they have a new out look when I call their names and the vibrate to move them along. Im amazed at how good they work! Try the shock on you self before you use it on your animal. Dont let your kids have the remote. Dont use it when your mad. Its a training aid not a punishment tool.