A friend of mine has a huge field type black Lab, the biggest one I've ever seen, and he's, well, pretty hyper. He is the biggest of his 4 dogs by about 30 pounds (He's a not fat at all 140!!) His brother visits once in a while, and he, like the rest of the 12 pups in the litter is a normal 95-100 pounds or so. There are no papers, he just seems to be huge 18 month old Lab. He's a great looking dog, very healthy and loves to get tennis balls and bring them back. One great thing about him is he doesn't chew much. I got head butted by him a couple of months ago, and I saw flashing lights and had a nice purple spot on my forehead for a week. He was devastated that he had hurt me, and tried to climb into my lap to console me. That was worse than the head butt.