public class Organism
{
    private string name;

    public Organism(string name)
    {
        Console.WriteLine("Organism.ctor");
        this.name = name;
    }

    public string GetName() { return name; }
    public void SetName(string name) { this.name = name; }
}

public class Animal : Organism
{
    private int age;

    public Animal(string name, int age) : base(name)
    {
        Console.WriteLine("Animal.ctor");
        this.age = age;
    }

    public int GetAge() { return age; }
    public void SetAge(int age) { this.age = age; }
}

public class Mammal : Animal
{
    private bool hasFur;

    public Mammal(string name, int age, bool hasFur) : base(name, age)
    {
        Console.WriteLine("Mammal.ctor");
        this.hasFur = hasFur;
    }

    public bool GetHasFur() { return hasFur; }
    public void SetHasFur(bool hasFur) { this.hasFur = hasFur; }
}

public class Dog : Mammal
{
    private string breed;

    public Dog(string name, int age, string breed)
        : base(name, age, true)
    {
        Console.WriteLine("Dog.ctor");
        this.breed = breed;
    }

    public string GetBreed() { return breed; }
    public void SetBreed(string breed) { this.breed = breed; }
}

Dog[] kennel = new Dog[]
{
    new Dog("Rex", 5, "Labrador"),
    new Dog("Luna", 2, "Husky"),
    new Dog("Milo", 3, "Beagle")
};

for (int i = 0; i < kennel.Length; i++)
{
    Console.WriteLine(
        $"{i}: {kennel[i].GetName()}, " +
        $"age {kennel[i].GetAge()}, " +
        $"breed {kennel[i].GetBreed()}"
    );
}