The webbed feet is what makes them the best swimmers. Labradors have webbed feet as there were breed to help fishermen in Newfoundland. (Yup!, The giant Newfoundland dogs are the ancestors of Labradors) Due to the webbed feet,they can swim faster as it enables to cut the currents in water better. read more
If you look at lists of animals who have webbed feet, you will find ducks, frogs, geese, swans and otters listed. For a good reason you won’t find dogs listed. The reason for this is that dogs don’t have completely webbed feet in the real sense of the word. read more
And, of course, they have thick, webbed paws and the longest toes of any breed that let them tear through the water. They also use those paws to swim in a unique way, with a down-and-out motion, rather than an ordinary dog paddle. read more