Dual-Mode Functionality: Bike Trailer & Push Cart- Quickly convert between bicycle towing mode (with detachable hitch) and push cart mode (360¡ã swivel front wheel). All-terrain wheels feature quick-release mechanisms for versatile terrain adaptation.Large Dog Optimized Design with Safety Features- Accommodates medium/large pets up to 88 lbs (max shoulder height: 23 inches, length: 31 inches). Low center of gravity prevents tipping + internal safety leash secures pets during transport.All-Weather Protection & Ventilation- Front door combines zippered mesh screen (ventilation) and waterproof vinyl layer (wind/rain barrier). Rear zipper door for easy pet access + reinforced PE anti-slip floorboard.Impact Protection & Stability- Heavy-duty corner guards shield wheels from collisions and abrasions. Steel frame with reinforced joints for structural integrity. Quick-release wheels enable compact storage (fits most car trunks).4-in-1 Versatile Applications- Functions as: Bicycle trailer, Weather-resistant push cart, Vehicle travel carrier, Indoor/outdoor crateIdeal for cycling, vet visits, travel, or daily use.