our dog went through a stage of doing this, probably when he was around 12 months? I just tied him up for a while whenever I put washing out and only let him off if I was outside with him, until the washing was brought inside again. One day he just suddenly stopped.
If that were me I would remove the dog from the washing equation, by fencing off a dog-friendly run (down the side of the house, or whatever) so there's an extra spot to put the dog. Ok so puppy won't want to stay in there all day every day, but the clothes dry pretty quickly in summer so it'll only be an hour or two at a time.
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