Perhaps I was not paying sufficient attention when I visited Vietnam, but I just don't remember being waist-deep in pigs everywhere I went. Chicken, yes; fish, you bet; snake (don't ask). But I can't recall it as being heavy on the pork.
I mention this because at Sen, a place that dances to authentic Vietnamese street-food rhythms, the menu suggests that pork is to the national cuisine what beef is to Argentinian and pickled fish to Nordic. Eight of the nine "small plates and nibbles" contain pork (mostly minced), including dishes that are described as squid cakes but tasted like pork rissoles, and crab spring rolls.
Making matters wincingly worse is that the pork is not free-range. I'd asked about the pigs' life before the mince stage, because, without being obsessive about it - I'd never eat dim sum again if I were - I reckon that any halfway upscale eatery ought to source cruelty-free chicken and pork.
Our waitress was quite unapologetic as she gave us the bad news but she was so down-to-earth and unaffected about it, it was impossible to object. It's a rare skill being relaxed and friendly without getting in diners' faces and she nails it.