The dimensions of the "cabin" on the Large Trailer are 33" x 22" x 26". When fully assembled, the overall trailer dimensions (including wheels and attachment arm) are 55" x 33" x 33" and it folds down to 34" x 23" x 9". With the Stroller Conversion Kit attached, the full dimensions are 60" x 33" x 39" (the handle is 39" above the ground). The wheels on the cabin are 20" and the wheel on the strolling kit is 16", and it is suitable for pets up to 110 lbs. The trailer weighs 25 lbs and the stroller conversion kit adds 8 lbs