JavaScript prototype with local variable

function Dog(breed, weight, height, age) {
    this.breed = breed;
    this.weight = weight;
    this.height = height;
    this.age = age;
    // local variable 'food'
    var food = 'Chappie';
};

var myDog = new Dog('Husky', '21kg', '53cm', 2);
// myDog.breed -> Husky
// myDog.height -> 53cm
// myDog.food -> undefined