My choc lab was in the bath tub with the grand kids at 6-wks. He absolutely loves water and I cannot keep him out of my wifes fish pond. He was swimming with the kids in the big swimming pool by eight wks of age. The main thing is, and I can't stress this enough, make it fun and he will love it. Start small puddles and work up to deep water. (rubber duckies to training dummies)