Fun fact...
Years ago I had a giant Argentinian bulldog. I would never own a bulldog, and the idea of 'owning' animals generally irks me, but that's what happened. Our neihgbor kept putting a bulldog puppy into our kid's arms, and after a while everyone wanted to keep it. And so we wound up with a bulldog.
We also had another dog, a fast mutt obviously built for racing, and the bulldog grew up alongside, thinking she had to run fast. And she did -- she didn't have much stamina, but she could sprint! She was a bowling ball, knocking everything and everyone who stood in her way, to the delight of children.
One summer day we took her to a nearby stream. We sat around for a while and the dog decided to go into the water. We heard people say that bulldogs can't swim, and watched her carefully to see what happens...
To our surprise, she waded into the water, and kept walking. Water came up to her head, and she continued walking on the stream bottom, like a hippo, completely submerged. A few seconds later she appeared on the other side of the stream, not missing a beat.