They do like the water don't they?

Oh yes and just try and keep them out of every puddle, stream, pool, lake or ocean that they see. If your Lab is in the water a lot, make sure you don't run into hot-spot trouble from the coat constantly being wet. Also make sure you know what is in the body of water your Lab is joyfully swimming in....they can get sick from contaminated water or water high in bacteria especially during the hot summer months.