We have known for a long time that our customers' pets love using their mats just as much as they do, but pets require certain precautions. We have designed the controller chord to be made of a bite-proof metallic material so your dog, cat, or any other pet can't damage it. One last protective feature is the special durable waterproof cover. Not even sharp claws can pierce this cover. Plus, you never have to worry about accidents putting a damper on your day, each purchase also comes with our standard waterproof cover as well as the special one.