Buddy, our Golder Retriever, of course loves to swim. We can't keep him out of our pool. He uses his nose to roll his tennis ball into the water and then jumps in to get it. He drops the ball back on the concrete and starts all over. He'll do this for an hour or more every day, even in the middle of winter. He's also "taught" our Mastiff, Sierra, to jump off the diving board. There's nothing funnier than seeing a 180 lb. dog plop into the pool.