PERFECT FOR TRAINING: Training your dog or puppy? This martingale-style collar provides limited correction with an audible cue, making it a great training tool. A STRONG CONNECTION: Protect your pup with the Chain Reaction Collar. The single-piece aluminum ring provides a strong, secure connection to your favorite Ruffwear leash. THE RIGHT FIT: Measure your dog’s neck where a collar would comfortably lie and select one of the following sizes: Small (11-14 in), Medium (14-20 in), or Large (20-26 in). EXTENDING ADVENTURES: Ruffwear’s Chain Reaction Collar is made from durable, woven fabric and a short section of stainless steel chain. And with reflective trim, you don’t ever have to cut your walk short. DESIGNED FOR DOGS: The Chain Reaction Collar features a separate, Quick Ring for ID tags that’s designed to make it easy to add and remove tags. The silicone tag silencer means less noise.