Rats!

​Mmm, I never thought that I would see a sail that had been eaten by Rats on the boat!
Usually I'd give advice to prevent the issues I see with sails, but this time all I can come up with are not practical.
Get a cat, set a rat trap, spread rat poison, or even a one of those circular rat discs over the mooring lines.
Or just call him Stuart Little and keep as a pet.

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