Your tough dog needs a tough collar; that's why Ruff Wear created the climbing rope inspired Ruff Wear Knot-a-Collar! The Ruff Wear Knot-a-Collar adjustable rope collar is made from 7mm rope that settles comfortably into fur, especially on pups with thick, bushy fur. This collar is strong, comfortable, and dependable with a single pieced, anodized aluminum V-ring for a secure ...