PetSafe Stubborn Dog in Ground Fence is specially designed for stubborn dogs that continually challenge the containment barrier. It has many features that make safe yet effective. The dog receives a warning tone as it approaches the barrier. Once in the barrier, the collar has four levels of progressive correction to stop it from leaving the containment zone.

The collar also vibrates with each correction as an additional correction. The anti-linger feature ensures that your dog doesn't stay in the correction zone and run down the battery.

The collar is waterproof and has a low battery indicator so you know exactly when you need to change batteries. It uses a standard 9 volt battery. It comes with both short and long contact points so it is effective on dogs with long or thick hair. The transmitter will cover an area up to 25 acres. Only the receiver can activate the collar which eliminates false corrections from televisions, cordless phones, garage door openers and other radio frequency equipment.

In addition, to keep your dog from being over-corrected, the receiver will shut down if your dog remains in the barrier for over 20 seconds. It has a wire break alarm and build in lightning protection.