We have the radio fence from Petsmart and its good enough to keep two Labs where they need to be but you can adjust everything including the shock level making it safe for even the smallest dogs. You can adjust the radius of the signal as well so your pet stays inside the area that you allow! Petsmart Stands behind their products 100% too, we recently had a collar go bad and they gave us a new one, no questions asked. The great thing about the Radio fence is you don't have to burry any wires! Just mount it on the wall or sit it on a table. Our unit is in one of the spare bedrooms.
This is it:
http://www.petsmart.com/product/inde...earch&keepsr=1
By the way its usually cheaper online!
