Choose the most suitable size: There are three sizes for this product. Please measure your dog’s nasal distance and bust to choose the most suitable size before buying. Because dogs of different body types need to use different sizes of this product.Every dog harness guiding device can adjust, please check this item picture. | Protect your beloved dog: Our product is specially designed for dogs with impaired vision. Use this product to protect your dog from collisions with surrounding objects. | Rebuild your dog’s confidence: Impaired eyesight will dampen the dog’s confidence in walking, which will result in the dog’s reluctance to move. Using our products allows dogs to walk with confidence and rebuild their confidence. | Easy to wear and light material: This halo for blind dogs comes attached to a vest harness 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 ultra-light EVA. Wearing this is almost no weight for your dog. | Does not affect eating and sleeping: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.