I think Stig was about 6 months old when he started enjoying going in our pool. We thought we go a defective lab at first. He would only stay on the step and didn't care to swim. One day we found him in the pool and now we can't keep him out! We had to block the stairs so he won't be in it all the time. Thankfully, he hasn't learned how to jump in, yet. He wants to but is still too scared.