I have had a litter from pure bread chow chow(60 lbs, black) mixed with American Pit (70 lbs) result, medium coat mostly black 75-90 lbs monsters. 6 in litter all large boned big scull, well mannered. Basically depends on parents genetics.
I have two. One(the mom) is purebred and the other(the son) The mom is about 3 feet from the ground to her head. But the son is only about a foot off the ground(he is only 5 months old)
Chows are considered a medium size dog. They range in weight from 45 to 70 pounds (20 to 32 kilograms) and can have a height anywhere from 18 to 22 inches (46 to 56 centimeters).