Yellow Wappen is designed to deliver the message to strangers who may not recognize your dog's boundaries. Each patch is a PAIR: one has hook backing and the other one has loop backing. You can attach back-to-back to wrap around on any leashes or harnesses! And last but not least, it really work! People would not touch your dogs or service dogs without words. Simple symbolic designs are universally understood even by children! Try out our Yellow Wappen for your next walk with companimals. It will provide happier and safe walking.