Aerospace-grade Aluminum Alloy: The pet wheelchair uses strong and lightweight aviation-grade aluminum alloy that's treated to resist corrosion and scratches. This makes the wheelchair durable and sleek. Exclusive Design: For option L: The dog wheelchair has an aluminum frame, adjustable straps, EVA wheels, foam leg straps and a 2m/6.56ft dog leash. It's designed to help pets with disabled hind legs move comfortably outdoors.For option XS:The dog wheelchair has an aluminum frame, adjustable straps, EVA wheels, foam leg straps and a 1.5m/4.92ft dog leash. It's designed to help pets with disabled hind legs move comfortably outdoors.For option S:The dog wheelchair has an aluminum frame, adjustable straps, EVA wheels, foam leg straps and a 1.5m/4.92ft dog leash. It's designed to help pets with disabled hind legs move comfortably outdoors.For option M:The dog wheelchair has an aluminum frame, adjustable straps, EVA wheels, foam leg straps and a 2m/6.56ft dog leash. It's designed to help pets with disabled hind legs move comfortably outdoors. Adjustable Size: For option L:The pet wheelchair/cart can be adjusted to fit pets of different sizes, including small dogs up to 48-88lbs. The straps snugly fit around the pet's hips for comfort.For option XS:The pet wheelchair/cart can be adjusted to fit pets of different sizes, including small dogs up to 15lbs. The product's structural design is aimed at assisting pets with disabled hind legs but normal front legs, helping them regain the joy of running outdoors.For option S: The pet wheelchair/cart can be adjusted to fit pets of different sizes, including small dogs up to 15-35lbs. The straps snugly fit around the pet's hips for comfort.For option M: The pet wheelchair/cart can be adjusted to fit pets of different sizes, including small dogs up to 35-48lbs. The product's structural design is aimed at assisting pets with disabled hind legs but normal front legs, helping them regain the joy of running outdoors. Easy Installation: The wheelchair is easy to assemble with simple instructions, no extra tools needed. Comfortable Drive: For option L:With 8 inch EVA wheels and secure straps, the dog wheelchair for back legs provides a smooth and quiet ride for pets, ensuring stability and silence on any surface. Pets are one of our family members, and when their hind legs are disabled, please don't give up. A wheelchair may give them a second chance.For option XS:With 5.5 inch EVA wheels and secure straps, the dog wheelchair for back legs provides a smooth and quiet ride for pets, ensuring stability and silence on any surface. Pets are one of our family members, and when their hind legs are disabled, please don't give up. A wheelchair may give them a second chance.For option S:With 5.5 inch EVA wheels and secure straps, the dog wheelchair for back legs provides a smooth and quiet ride for pets, ensuring stability and silence on any surface. Pets are one of our family members, and when their hind legs are disabled, please don't give up. A wheelchair may give them a second chance..For option M:With 8 inch EVA wheels and secure straps, the dog wheelchair for back legs provides a smooth and quiet ride for pets, ensuring stability and silence on any surface. Pets are one of our family members, and when their hind legs are disabled, please don't give up. A wheelchair may give them a second chance. Package Content 1× Tool Kit 1× 1.5 m Dog Leash