Practically new dog trailer. Purchased 3 weeks ago. Used twice... my dog is not a fan. Come we all you need including marker flags, mounts, etc. Adjustable leash length maximizes pet safety and comfort Holds pets up to 50 lbs "Doggy-door" in rear offers convenient entrance and exit for pets Removable and washable trailer liner provides non-slip surface for added comfort Unique collapsible frame with quick-release wheels fold up for convenient sub-compact storage and transport 16" aluminum rims and air-filled tires are smooth and steady 2-wheeled design limits torque placed on bicycle Adjustable bug screen protects your pet from pesky mosquitos