If you bring up a dog around water most of them will take to it just fine.
My pit mix loves the water, there not supposed to though. She will swim and play for hours.
One the best water dogs I've ever seen was a boxer, my girlfriend at the time rescued him so my lab puppy could have a buddy, the dog was abused and was kept inside for the most part. He had never even seen water when we got him.
We took him to a secluded beach and he was terrified, shaking and almost collapsing but after he was ankle deep and trying to get to us and my dog, he swam like a champ, he would swim across the local pond no problem, never had any issues with not being able to touch bottom. He was almost too brave for his own good.
I have friends that have French bulldogs and Boston terriers that love the water and take em out in their boats.
Even my girls mini yorkie loved the water before we had to put him down
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