When your dog is getting ready to deliver a litter of little ones, a whelping box can be a big help in keeping the pups all in one place during and after the birth. It doesn’t have to cost a fortune; it’s not hard to make even a large whelping box for the cost of a sheet of plywood and a few other inexpensive materials.
Cut a single sheet of 3/4-inch plywood in half. Save a 4-foot square to use as the bottom of the box and cut the other section into three strips 4 feet long and 16 inches wide. (Many lumber yards and home centers will make these cuts for you for little or no charge when you buy the wood.)
Cover the inside of the bottom and both sides of the other pieces with self-adhesive contact paper. Use a staple gun to secure any loose places. Alternatively, paint the pieces with nontoxic latex paint and allow it to dry thoroughly.
Place one 16-inch piece of plywood on its edge across one side of the bottom section to form a wall. Use 1.5-inch wood screws to hold it firmly in place. Set the other two 16-inch sections at right angles to the first piece and screw them all to the bottom section and to each other.
Put a board measuring 1 inch by 4 feet by 1 foot across the remaining opening to make a doorway the mother can step over. Use 1.5-inch screws to attach it to the bottom and the sides of the box.