You still have time to order a lamb shaped cake pan, if you'd like to make this cake for Easter and still need the pan!
Last year I purchased a Nordic Ware 3-D Spring Lamb Cake Mold, to use for our Easter Cake, and it turned out so cute! I just used a boxed pound cake mix, and made sure to grease and flour the pan really well, and thankfully had no complications removing the lamb from the pan.
Other Cake Pan Options Include:

Lamb Cake served with Fresh Strawberries and Whipped Cream
Here are the Preparation, Baking and Decorating Instructions from NordicWare
Preheat oven to 375˚F. Generously grease inside of the molds (top and bottom halves) with solid vegetable shortening. Dust with flower. Pour prepared batter in bottom half of mold (approximately 3 cups). Place top mold over bottom half, interlocking seams. (Top half has vent holes to permit steam to escape.) Place mold on cookie sheet and bake 375˚F for 45-55 minutes, or until cake tests done. (Test with toothpick through vent hole.) Remove mold from oven. Cool 5 minutes. Turn mold before standing in upright position. Trim bottom of cake if surface is not flat. Place a dab of icing on plate and stand mold in upright position. Frost with fluffy icing and decorate with jelly beans, raisins, cherries, or chocolate chips for the eyes and nose. (Best results cool cake in refrigerator or freezer before frosting, this makes a firmer surface for icing.) To enhance this delightful cake mold, place green tinted coconut around base of lamb; add jelly beans and a colorful bow at the neck.
* Pound cake mixes (16 oz. size) can be used in molds. Mix per directions on package.
* If using regular cake mixes (pudding added) decrease liquid by 1/4 cup. Use excess batter for cupcakes.
If you end up making this cake, be sure to take pictures to share since we will be hosting another "Celebrating Easter" link up on Easter Monday!