Inheritance example - passing objects in constructors

inheritance_example.cpp

#include <iostream>
using namespace std;

class Pet{
protected:
	string Name;
	string Breed;
	int Age;

	Pet(string name, string breed, int age)
	{
		Name = name;
		Breed = breed;
		Age = age;
	}

public:
	void Introduce()
	{
		cout << "He is the " << Age << " year old " << Breed << " called " << Name << ".\n";
	}

	string getName() {
		return Name;
	}
};

class Dog : public Pet {
public:
	string Characteristic;
	Dog(string name, string breed, int age, string characteristic) : Pet(name, breed, age)
	{
		Characteristic = characteristic;
	}
	void Information(){
		cout << "He is " << Characteristic << ".\n";
	}
};

class GermanShepherd : public Dog {
    Dog& DogFriend;

public:
	GermanShepherd(string name, int age, string characteristic, Dog& dogFriend) : DogFriend{dogFriend}, Dog(name, "German Shepherd", age, characteristic)
	{
		//DogFriend = dogFriend;
	}

	void Info(){
		cout << Name << " has a friend named " << DogFriend.getName() << ".\n";
	}

	void biteFriend() {
		DogFriend.Characteristic = "not so aggressive anymore";
	}
};

int main()
{
	Dog arslan = Dog("arslan", "Mastiff", 2, "very aggressive");
	arslan.Introduce();
	arslan.Information();

	GermanShepherd fido = GermanShepherd("Fido", 1, "friendly", arslan);
	fido.Introduce();
	fido.Info();
	fido.biteFriend();
	arslan.Information();
}