Daan again

public interface IAnimal
{
	string Type { get; }
}

public interface IDog : IAnimal { }

public class Foo
{
	public Foo(IDog animal)
	{
		Console.WriteLine($"Type: {animal.Type}");
		// a new requirement arrives, the dog now has to Bark
		// the fix is *NOT* to change existing code
		// Ref: Open/Close Principle
	}
}

// instead:
public interface IBark : IDog
{
	void Bark();
}

public class Bar : Foo
{
	public Bar(IBark bark) : base(bark)
	{
		bark.Bark();
	}
}