Wow, that's a hard one and one I
completely relate to. My dogs also like to bark when we get in the pool. For some reason they think it's a huge game. In our case we've found it stops them by giving them a (very) little splash or a bigger splash near them. I do understand that sometimes you don't want to ruin their fun though. When our pool starts up one of the jets gurgles and bubbles for a minute because of the air working it's way through the solar panels. Spike has decided this is the funnest thing ever so twice a day the pool comes on and if we are outside, Spike "attacks" the jet and barks like crazy. Then the waterfall start immediately after and he's after the waterfall. It's a lot of barking but he loves it and it's only for a minute or less. If my husband starts to go in the backyard Spike gets all excited thinking he will turn the pool on and so of course he usually does. It takes so little to make them happy.

It's really his favorite game.
The flip side is we had neighbors who would leave their barking dog outside and it drove me CRAZY! Not the barking itself (okay, the barking was annoying) but mainly because it would keep my dogs on high alert and I had to work pretty hard to keep them from barking their little heads off.
Having said all that, calling the cops was really overkill!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226