I know every companion gives you a special story if they like you enough.

But...does Dogmeat have a backstory? Played 61 hours with him at my side and not once did I ever have anything other then the normal dialogue options.

He wasn't even named Dogmeat when I first met him, and his name only changed when Preston called him Dogmeat. Maybe Preston knows his former owner?

I'm guessing Dogmeat doesnt have a backstory huh? I wonder who his former owner was. Might make for a good mod quest.

I haven't encountered it myself, but as far as I know, Mama is the first one to call Dogmeat by his name (or has been on my two characters so far, anyway).

Nick also calls him dogmeat on a quest.

Right, Nick also refers to Dogmeat as an experienced commonwealth inhabitant, that made me think about his backstory too, and why everybody knows him