It's about 4 ft from floor to top. Think of the 3'x4' "box". There's a single sheet of steel goes vertically up from a 4' side, curves over the top & down to the other 4' side. The front (tow-bar) end is a rectangle extending into a semi-circle. The "loading ramp" is exactly a rectangle and when it's shut, there's a semi-circle of weld-mesh above it (which doesn't move with it) to give the dogs air.

Matlock's very close. PM me if you want a phone number. (But not after 6.30 this eve, 'cos I surf from work.)