I am writing a novel and I need a one word/short phrase for the most common way an individual would praise a dog in German. Either the equivalent of the English phrase "Good Boy" or a popular alternative that a fluent German reader would recognize right away.
It is very difficult, if not impossible, to tell the "most common/popular" phrase.
In my opinion, an often heard phrase to praise a dog is
Other possiblities would be
I think all would be recognized by a German speaker in that sense. I would prefer the first, but it's your decision, which you like best.