Edit in JSFiddle

var Animal = (function() {
    var species = '';

    return {
        getSpecies: function() {
            return this.species;
        }
    }
})();

// Chain the prototype back to animal
var myDog = Object.create(Animal);

// Add a new function to initialize the object
myDog.init = function(name, age) {
    this.species = 'dog';
    this.name = name;
    this.age = age;
}

// Add a new function to call the dog
myDog.call = function() {
    console.log( "Here, " + this.name );
}

// Initialize our new object
myDog.init('Fido', 4);

// Call each method on the object
myDog.call();
console.log(myDog.getSpecies());