Some guy recently asked if it is illegal for dogs to bark in Germany and he only got joke responses. Unfortunately, the mods have locked that post, and that poor guy just got a lot of funny comments but no information.
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The answer is yes, the Ordnungsamt can fine you for a barking dog. This is usually only an issue between neighbours and is most commonly due to noise, but it is a real thing: [https://www.bussgeldkatalog.net/hundegebell-ruhestoerung/](https://www.bussgeldkatalog.net/hundegebell-ruhestoerung/)
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calling u/xfrombelow/ this is for you.
But the answer for the specific situation the OP of the barking thread described is clearly no.
Kurzes Bellen: Ein nur kurzes Bellen des Hundes ist für Nachbarn zumutbar, weil es außerhalb des Einflussbereichs des Tierhalters liegt.
Also the link you provided talks about noise where you live – original OP talked about his dog sometimes barking for a short time while sitting in a cafe or being outside.
So as long as non of the barking victims starts writing a noise protocol (also your source), he is completely fine.
Ruff.