PrimeDog is one of the few places in São Paulo, where you can get some decent vegan junk food. The staff is very friendly, I am not sure if they speak English though.
They offer a large variety of vegetarian and vegan dishes, including burgers, hot dogs, nuggets, beirute, cupcakes, ice-cream and soy milkshakes.
They also use a different frying pan for vegan orders.
Don´t forget the bonus card! You get a stamp on your bonus card when you buy a combo and with ten stamps you receive a free combo.
Cons: Sometimes dirty tables upstairs, Some items are pricey