A House in the Woods by Inga Moore
From Candlewick Press:
One little pig has made a little den for herself in the woods, and another little pig has a small hut next door. One morning they return from a walk to find that their big friend Bear has moved into the den and an even larger Moose into the hut. CRASH! With both homes collapsed, they’re all in a pickle—but what if they find a way to build a house in the woods that all four of them can share? With lush, whimsically detailed illustrations and a cast of endearing, industrious (and most accommodating!) characters, Inga Moore constructs an inviting story of friendship that kids will be happy to visit awhile.