I disagree that they make bad guard dogs. I know that they generally make better watch dogs, but I've heard many stories about labradors attacking people in defense of their family.

They are very energetic, and are quite prone to obeseity, so they need alot of exercise. They love to swim and play fetch, and they are quite friendly and outgoing. Great with kids, and they make great family dogs. Otherwise I can't really say much that others haven't already said...