Owners of Labradors are probably familiar with their dogs jumping into everything that contains at least trace amounts of water, murky ponds, muddy puddles, etc.
An answer to a question about a certain sort of amoeba brought up the idea that it should be safest for the dog to only swim in chlorinated water. The answer has since been edited, but I still consider the question to be interesting.
Swimming in chlorinated water is safe for humans, as long as you don't swallow too much. I assume that this is also the case for dogs, but is hard to tell a dog not to swallow any water. Is it safe to let a dog swim in a chlorinated pool?