I used to have one that was similar to it except that it wasn't wireless. I had a rat terrier and anyone who has ever owned a terrier knows how much they love to wander. We had the fence turned all the way down and he got shocked once and from then on whenever he had the collar on he would not take on step off of the porch. We tried it on our golden retriever but she always stayed in the yard so it was pointless. I wouldn't recommend it on small dogs but larger dogs should be fine.