If he was having to evacuate, why not just leave the dog in the house if he couldn't bring it with him for some reason? True, the dog still might have drowned if the water got that high, but it would be better than tying it up to potentially drown with no chance.
And if you are worried about the dog doing it's business in the house, confine it to one room, preferably one with a hard floor, lay down a bunch of newspaper, and deal with it when you get back. Garage would work if you have one.
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