Ruffwear Rope Knot-A-Collar Collar- 20-26in - The Knot-a-Collar is a low-profile, climbing-inspired everyday dog collar. Clean and elegant, the Knot-a-Collar settles comfortably in short or long fur and reduces matting. Features Reflective Rope Keeps Dogs Visible In Low-light Conditions Pairs With Our Matching Knot-a-Leash