Mix 1 part Portland cement, 3 parts damp sand and water in a mixing trough using a trowel. Add in small amounts of water until you achieve a thick consistency that can be patted into shape with your hands.
Place the animal mold on a work surface. Spray the inside of the mold with a mold release spray. It is important to coat the entire inside of the mold to avoid it sticking as the cement dries.
Pour the mixed cement into the mold and pat it down with your hands to make sure it is firmly filled and is free of any air bubbles. Place the mold in a dry place overnight.
Remove the mold once the cement has hardened. Mist the cement garden animal with a spray bottle of water, and place it in a trash bag in a cool dry place.
Keep the ornament evenly moist for three days by keeping it covered in the bag and misting it several times throughout the day. Remove the bag and place the ornament in your garden.