C#

class Dog {<br />
  void wagTail(){...};<br />
  void chewSlippers(){...};<br />
}

class doberman : Dog {...)<br />
class labrador : Dog {...}<br />
class chihuaha : Dog {...}<br />
etc.

interface IDog {<br />
  void doTrick();<br />
}

class doberman : Dog, IDog {...)<br />
class labrador : Dog, IDog {...}<br />
class chihuaha : Dog, IDog {...}<br />
etc.

class Dog : IDog {<br />
  void wagTail(){...};<br />
  void chewSlippers(){...};<br />
  void doTrick(){...};<br />
}

class SplashScreen : Form
	{
		Image splashImage;
		public SplashScreen()
		{
			this.TopMost = true;
			this.ShowInTaskbar = false;
			this.FormBorderStyle = FormBorderStyle.None;
			this.StartPosition = FormStartPosition.CenterScreen;

			this.BackColor = this.TransparencyKey = Color.White;
			this.BackgroundImage = splashImage = Bitmap.FromFile(SplashFileName);
			this.Size = this.BackgroundImage.Size;			
		}
		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e);
			e.Graphics.DrawImage(this.splashImage, 0, 0, this.Width, this.Height);
		}
	}

class MainForm : Form
{
	public static void Main(String[] args)
	{
		//Do something here
		
		SplashScreen splash = new SplashScreen();
		splash.Show();
		
		MainForm mainForm = new MainForm();
		mainForm.Shown += delegate(object o, EventArgs ev)
		{
			splash.Hide();		//Hide and Dispose the Splash Form When mainForm is shown for the first Time
			splash.Dispose();
			mainForm.Activate();
			mainForm.Focus();
		};
		//Do something more here
		mainForm.Show();
		Application.Run(mainForm);
        }
}