So I did recruit dogmeat, then i got a pop up message saying: "You now can use the workshop of..." (can't remember the name). After I captured my first supply village and wanted to return to that guys, he was on his way to that village, which I got for recruiting Dogmeat. He told me about some gunner attack but actually nothing happend. I dunno, maybe the broken gunner quest has something to do with the "Dogmeat" thing.