And Dogmeat in f3.isnt the same as 1 and 2.
They are all just called dogmeat as homoage to f1 and as i said the fallout series is greatly influenced by A boy and his dog so f1 dogmeat is a homoage to that story.
A dog companion is a must in a fallout. That dog will always be called dogmeat even if his name is something else because of all of the above.
Just watch A boy and his dog and see how much it influenced fallout. You can also watch madmax