The end of the reveal for Fallout 4, the protagonist says to the dog, "Let's go pal".

There used to be a dog food called "Pal", you know, meat for dogs ... Dogmeat.

http://1coast.com.au/SiteFiles/1coastcomau/700g%20Pal%20Dog%20Food%20Can.JPG

Let's go!! Let's go let's go let's let's go let's let's go let's let's go let's let's go let's let's go let's let's go.... FALLOUT 4!!!!!!!!!!!!!!! *mental breakdown*

Mmmm dogmeat.

I hope its dogmeat id mess myself if so.

Somebody mentioned that dog may be the protagonist's from pre-war times when he was still a baby, hence the dog searching the house/crib,etc.

If so, that would be an awfully old dog, considering the protagonist looks to be at least mid-20's at their "reunion?" at the end of the video. Maybe the two events are just unrelated, or related in a way we couldn't guess yet. Or maybe that is just a really old dog. Hmm...

But I killed Dogmeat back in DC. How can he still be alive?! D:

Still, it'll be cool if the dog stayed at home while the PC goes out to explore the world.

Dogmeat is a recurrent character in the Fallout games, he first appeared in Fallout 1, on the west coast. Technically Dogmeat from Fallout and Fallout 3 are not the same dogs, and it probably won't be the same in Fallout 3 and 4.

/captain obvious

I'm going to name the next dog I get Dogmeat.

I might name her bandit if that is an option

Yeah, I'd hope there would be an option to name the dog. I'd name it bunny, or cat.. or hedgehog. I want to be able to give the dog a complex.

Him*

And so you might be John, John Quest ????

No, the In game dog reminds me of a dog in our family named bandit. He was always finding odd things to show you