Preheat the oven to 350 degrees. In a bowl, stir together the eggs, pumpkin puree, milk powder and flour; add 2 tsp. water, or enough so that the dough just comes together.
On a lightly floured surface, roll out the dough 1/2 inch thick. Cut into shapes with 1-inch cookie cutters. Gather the scraps, combine, roll and form more biscuits; repeat until all the dough is used.
Place the biscuits 1 inch apart on an ungreased baking sheet. Bake for 20 minutes, then turn over and bake until hardened, another 20 minutes. Let cool on the pan for 5 minutes.