All of my earlier dogs were waders and not swimmers. Nothing I could do about it, that's just the way they were. I wouldn't hold my breath on your dog suddenly discovering the joys of swimming no matter what you try.
One of my current dogs is part fish and loves swimming. Another one of my dogs is a wader but gets all upset when my other dog goes deeper for a swim and will try to go out too. The problem is that he just can't swim well and is in serious danger of drowning. I put a life vest on him now so I don't have to dive in and rescue him.
Elaine and the herd