Invisible Fence Brand creates pet containment ... and even after training sessions, and turning the collar up to the maximum setting my dog is still getting out of the fence.

$319.95 at Amazon The weight and shock level of some collars make them more appropriate for larger dogs. The PetSafe Stay and Play invisible fence is designed for dogs as small as five pounds.

Puppy Bumpers are Stuffed Safety Collars to prevent your little pups from escaping through the gaps in your fence. Puppy Bumpers are the perfect choice for most dogs, making even the tiniest pups ...

like the Invisible Fence GPS Dog Fence & Tracking Collar. The "fence" consists of an underground cable wire, a special dog ...