Here's my best. Didn't weigh it, but my late best friend Sharpshooter and I couldn't move it more than about 6" at a tug when trying to reposition it for the pic. I'm guessing he was pretty close to 400 pounds.
Here's the second best. Didn't put him on the scale either, but did measure him with a tape measure. He measured 60" from the tip of the nose to the base of his tail and 32" from the bottom of his from hoof to the top of his shoulder.
John