Some fellow on here made a cracking job of a sound senor activated hose or sprinkler. There would be a market for such a device for sure. Nothing wrong with water as long as the dog knows it is not you espeacially a young dog.
When my dog was a pup he was a right pain in his crate at night and one night I had must been a spoon full of water left in a cup and I threw it at him. He remembered that for years and his 5 now but if I approach his create with a cup his very suspicious so these things stick