Lifting a dog into a stroller is the part that gets harder as the dog ages, so the back of this one converts. A detachable back door drops down and becomes a ramp, letting a dog walk in under its own power instead of being picked up, which reduces the need for lifting or straining on every outing. The entry sits low as well, which settles pets that are uneasy with heights.The carriage measures 26.5 by 15 by 27.5 inches and carries up to 66 pounds, with 8.5 inches of ground clearance underneath. That clearance is what lets it take asphalt roads, grass, gravel roads, and speed bumps rather than grounding out at the first curb.Wheels are specified for the same reason. The front pair is shock-absorbing with full 360 degree rotation and locks when a straight line is wanted, while the rear pair is robust and fitted with foot brakes for smooth and safe stopping. Both are large rather than castor-sized.Visibility and airflow come from mesh on five sides plus a zippered mesh front door, which also allows quick access during outdoor adventures without opening the back. Above, the shade canopy adjusts to several positions and detaches entirely when it is not wanted.The shell is high-quality 600D Oxford fabric, wear-resistant and built to last, over a robust metal frame that resists deforming. The cover detaches for easy cleaning, held by hook and loop fasteners, and a removable tray provides a temporary table for drinking or eating. Folding is quick and flat, down to 40.5 by 22.5 by 12.5 inches at 20 pounds.