Rowen was the same at first too, he didn't want anything to do with the deeper water but loved to wade in where he could stand. We also took him to the Potomac! We found a nice little beach that had very clear water and was very shallow a little distance away from Belle Haven Marina (if you know where that is) and I started to tease Rowen with a stick. I gradually walked just a few feet out and started to throw the stick into the water a few feet at a time for him and eventually he was so excited he just kept getting deeper and deeper! Also, if you actually go to Belle Haven Marina, they have a nice little calm cove with a green mat as the beach area where they like to launch boats and the dogs that go there love playing in the water there. I was launching our boat and Rowen started to swim away! Also, if you take your puppy with some of his puppy friends who love the water or chasing tennis balls, the puppy tends to chase his friends into the water. Shallow creeks are good also to get him used to the water. I don't know if you live in Virginia or Maryland, but in Clifton there's a nice hiking area you can go with your dogs along Bull Run (the park is called Hemlock Overlook) and in the parts of Bull Run where there's not as much of a current (usually there are tiny beaches where you can stand) the dogs love to wade/swim around.