How big do the Great Pyrenees get? When they reach full maturity, the height of the male Great Pyrenees ranges between 27-32 inches, whereas the females attain a height of about 25-29 inches. While the females are only slightly shorter than the males, the two differ significantly in weight, with the males weighing 112-121 pounds at the age of 17 months and the females weighing merely about 92 pounds.