Potty Training Bells Help New Puppies & Older Dogs Learn Good House Manners | Adjustable Loop & Length Fits Every Size Dog & All Door Handles &hellip; DURABLE, CHEW-PROOF NYLON: Designed for years of use, this stylish black ribbon with bells is crafted from high-quality materials that stand up to even the most rambunctious puppy. ADJUSTABLE LENGTH: Hang at just the right height to fit your dog, whether a tiny puppy or large breed. JUST SNAP & USE: Easily hang the ribbon from any door handle. No tools necessary, and it works with both standard and patio doors. PLEASANT CHIME: Loud enough to be heard without being obnoxious, the ringing of these bells is much preferred over a barking, whining dog. BONUS TRAINING GUIDE: Offers step-by-step instructions for success written by a professional dog trainer.