DogWatch® products are protected under U.S. Patent Nos.: 5,353,744; 5,465,687; 6,079,367; 6,467,435; 6,360,698. © 2010 DogWatch Inc. All rights reserved. No photographs,illustrations or text can be reproduced in any form without the express written consent of DogWatch Inc. DogWatch Hidden Fences should not be confused with Invisible Fence® or Invisible Fencing® which are products and registered trademarks of Invisible Fence, Inc.