'Tis the season for cookie baking, especially cut-out sugar cookies. If your cookies tend to lose their shape as they bake, there's a good chance it's because they got too warm. (I bet your sugar cookie recipe tells you to chill the dough, right?)
A simple fix - once you finish a pan of cutouts, pop them in the fridge for about 15 minutes. Chilled cookies will keep their shape, warm cookies will spread as they bake.