Dunkin’ Donuts has committed to acquiring all of the eggs served on its domestic menus from cage-free sources by 2025, the company said Monday. The snack and beverage division of Canton, Mass.-based Dunkin’ Brands Group Inc. expanded its cage-free egg commitments over the next 10 years in an announcement coordinated with the Humane Society of the United States, which said the switch would affect about 1.4 million egg-laying chickens a year.