Labrador Retrievers are sturdily built strong dogs. In proportion they almost resemble a square, they have a dense body and strong legs. The maximum height of a dog is 60 cm, which is why Labradors are classified as medium-sized dogs, but due to their powerful physique, they can visually appear much larger than they are. Weight ranges from 25 kg for a small bitch to 38 kg for a large male. Dogs bred for field trials are usually taller and somewhat thinner in build.