Size and fit - There are 2 sizes. Please measure your dog's nose distance and chest circumference before purchase to choose the best fit. The harness guide is adjustable to fit different body types. Please refer to the item image for reference. Protection for your dog - Specifically designed for visually impaired dogs to help protect them from collisions with surrounding objects during movement. Confidence support - Limited vision can reduce walking confidence. Using this product helps dogs walk more confidently and rebuild their confidence over time. Lightweight and easy to wear - Attaches to a vest harness with a double buckle design to reduce the risk of escape. Made of aluminium strip, SBR and foam, providing almost no additional weight for your dog. Use scenarios - Indoor navigation near furniture and walls to prevent bumps. - Outdoor walks in unfamiliar or cluttered environments. - Training sessions to gradually rebuild comfort and confidence in new surroundings.