@snood,
I've spent time, back in the day, in P. Vallarta, and even in the sixties there were good restaurants, whether ordinary cafes or fancy, though it was a small town with only one traffic signal at the time.
I'm odd, I suppose, as I've spent three months off and on in Italy and never had any american type food there, much less gone to McDonald's. As it happens, I think it was the first McDonald's that energized Carlo Petrini to start the Slow Food Movement.
https://en.wikipedia.org/wiki/Slow_Food
Yep, that was it, I just looked it up. I still have my Slow Food pin, though I'm not an official member these days. Italians in particular weren't keen on american franchises coming to their land of small trattorias. There has been resistance around the world, futile, I gather, as people in other places do want to try american food and that's reasonable. It's just as an american, it furrows my brow to not enjoy the foods of the visited country.
Anyway, my view is that by now you can find Dunkin Donuts in Rome, but why would you do that if you do get to travel there? I suppose it's a craving for food from home. And to answer your question, sure you can choose Domino's.