Tasty outside. Nutritious inside. Hartz Yogurt Soynut Surprise for Small Animals is a highly palatable treat that offers your pet a special surprise. Hidden inside the yogurt is a tasty soynut, making these treats both delicious and fun for your pet. Hartz Yogurt Soynut Surprise for Small Animals also offers the chance for you to hand- feed your small animal, strengthening the bond between owner and pet.