Universal Coupler for Most Adult Bikes: This dog bike trailer easily attaches to 22-28 inch rear wheel bicycles with the included coupler—quick to set up, stable to tow Spacious & Comfortable Cabin: With a 31.5 x 21 x 22 in interior, the pet cart bicycle carrier's cabin provides plenty of room for medium to large dogs. Pets can lie down or turn around comfortably, and the rear door ensures easy entry and exit Weather Protection & Ventilation: The bike dog trailer's front clear PVC flap keeps wind and rain out, while the mesh panels provide excellent airflow and visibility. Your pet stays dry, cool, and calm, with protection from annoying critters Safe Ride with Smart Features: Built-in leash keeps your pet secure inside the dog trailer. A rear reflector and flag improve visibility, while the reinforced steel frame provides reliable protection on the road 2-in-1 Trailer & Stroller: Easily switch between a bike pet trailer and a pet stroller in seconds—great for both leisure rides and daily walks. It's the ideal companion for outdoor adventures with your furry friend