Features:1、Choose the Proper Size: 2 sizes available. Please measure your dogs distance and chest part to choose the most suitable size before buying. Because dogs of different body types need to use different sizes of this product. Every dog harne guiding device can be adjusted.2、Protect Your Dog: Our protective vest ring is specially designed for dogs with impaired vision. Use it to protect your dog from collisions.3、Rebuild Your Dogs Confidence: Impaired eyesight will dampen your dogs confidence in walking, which will result in the dogs reluctance to move. Using our products allows dogs to walk with confidence and rebuild their confidence.4、Easy to Wear: This guiding device for blind dogs comes attached to a vest harne so your pet can wear it easily. And the double buckle design can prevent the dog from breaking free. This product is made of soft knitted fabric and ul-light EVA. Easy and comfortable to wear.5、Practical Pet Acceory: Using this product will allow your dog to enjoy the daily activities that he did when his eyesight was intact, including eating and drinking, sleeping or playing, all while staying confidently bump-free.Specifications:Material: aluminum strip + SBR + foamFunction: This protective vest ring for blind dog helps protect your dog from collisions when your pet bumps into obstacles, so as to avoid accidental injury. Both neck and chest size can be adjusted.Size(about): S = ring diameter 22 (suitable for 4-10KG) M = ring diameter 33 (suitable for 13-20KG)Packing List:Option 1: S Guiding Protective Vest Ring*1Option 2: M Guiding Protective Vest Ring*1(please measure the size and choose the appropriate size)Notes:Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance.Due to manual measurement, there might be a tolerance in the product size.