How exactly do I get my "Dog" renamed to "Dogmeat"?

I'm level 19 or so and my Dog is still named "Dog" and not "Dogmeat" like I'm seeing around the internet.

Through a little research I've heard things like "Just keep doing stuff for the minutemen" or "Mama Murphy will tell you the name of your dog."

I think I've done everything for the minutemen. I have the castle and now I seem to be granted endless quests of helping random groups around the commonwealth.

Mama Murphy also doesn't seem to care about my dog at all. I've told my dog to investigate her, but nothing. I've given her Jet and built her chair. Now she's asking for Mentats. If I keep doing stuff for her will she eventually name my dog?

Or do I need to do something else entirely?

Solution 1:

Spoiler:

During the quest "getting a clue," if you have Dogmeat with you you can refer to him for the purposes of being a bloodhound.

This will fix it.