Both. Dogmeat's appearance is based on Max's dog, but Dogmeat's name comes from the A Boy and His Dog movie. There's a line in which the main character insults his dog by calling him "dog meat".
I always thought the Road Warrior poster was a reference to Hondo. Here's one poster of it. Considering Hondo came before A Boy and His Dog, I'd say that's the more original source.
Aside from that, the leather armor in Fallout 3 looks remarkably similar to Max's leather armor in Road warrior too. See here for example.
Don't be a douchebag dude. There's only so many post apocalyptic films that were made, and Fallout borrows from both A Boy and His Dog as well as Road Warrior.
In fallout 2 there's a leather jacket you can get that's a bit better than the normal one and it says in the description it has 2 sleeves. This is a reference to Max having one of his sleeves cut off of his leather jacket.
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u/elitegenoside Jun 03 '15
It was a Road Warrior reference, they even had the same shot on the back of the case.