[#1 Rated Electric Dog Fence] Invisible and Wireless Containment System is Totally Safe, Effective & Reliable for Pets 8 lbs & Up - Easy Installation for Instant Results in Yards Large & Small COLLARS WORK PERFECTLY FOR DOGS OF ALL SIZES &ndash; Your dogs&rsquo; safety is your top priority and it&rsquo;s ours too, which is why our collars are adjustable to safely fit dogs of all sizes. DURABLE &amp; WATERPROOF &ndash; Simple Pet wireless fence collars are built to last and can withstand wear and tear in all weather. 100% SATISFACTION GUARANTEED &ndash; We have over 10,000 Perfect Orders &amp; a stellar 4.9-star Seller Rating, so you can be confident that your satisfaction is always our #1 priority &amp; that we&rsquo;ll do everything in our power to make sure you have an excellent experience. EASY TO USE RIGHT OUT OF THE BOX  Once you have your Simple Pet invisible fence set up, adding extra dogs is a cinch and doesnt require any further installation or any hassle. And that's not all... Your purchase includes FREE gift of our 20-page, expertly written eBook: The Ultimate Guide to Dog Training is packed full of 35 practical tips, tricks and tools to get your furry friend to behave like a champ! COMPATIBLE COLLAR FOR #1 RATED ELECTRIC DOG FENCE &ndash; The Simple Pet wireless fence (sold separately), designed to be both humane and immediately effective, allows you to keep multiple dogs safe in your yard at any time.