Innotek SD-3000 Basic Contain 'N Train Dog Fence
Product Review (submitted on July 1, 2011):
We use this system to keep our 6 lb toy terrier out in our yard. The collar is kind of large for a 6lb dog and the batteries only seem to last about 4 months or so. Generally it works well but we wish we would have invested in a smaller dog electric fence system.