Regarding the tuck-up. This is not necessarily a good indicator in a Lab mix. Labs do not have a tuck at all, so it's possible this dog will not, as well. But I do agree that the numbers do not always tell the whole story. My guys are sighthounds, and as such, look a lot more lightweight than they are. Most people have no clue that my boys are about 100 lbs., because they are mostly muscle, and little/no fat. And the Greyhound does show some rib, but she should, because she IS a Greyhound!