using System;

public class Program

{

    public static void Main()

    {

        Dog d = new Dog(15,25.0,"Chow");

        d.Bark();

        int age = d.DogAge();

        Console.WriteLine("My dog's age is " + age + " in dog years.");

    }

​

    class Dog{

        private int age;

        private double weight;

        private String breed;

        public Dog(int a, double w, String b){

            this.age = a;

            this.weight = w; 

            this.breed = b;

        }

        public void Bark(){

            Console.WriteLine("Rrruff, rrruff");    

        }

        public int DogAge(){

            return this.age*7;

        }

    }

}