Dogs, like people, are a product of heredity as well as environment. They have a hard time denying either. The typical pit bull owner often claims his dog was not bred to bite. Take a picture of the dog that reveals the dog's sex. Use your own camera and film.
People routinely overestimate a dog's weight, especially if they are on the ground, looking up.
Most measurements are taken at the highest point of the shoulders, commonly called the withers. Measure in inches. Remember, all black labs are black, but not all black dogs are labs. There are also combinations such as speckled, spotted, dappled, ticked, roan, brindle, and belton, and every owner has an opinion on how his dog's color should be described. Prevent contradictions in the courtroom, settle on one term, preferably the same one the owner uses and stick to it.