Fastest Type Comparison?

Question

The following event can possibly get called hundreds of times a frame.

public bool OnCollision(Body body1, Body body2)
{
 if(body2.Tag is Dog)
      ((Dog)bo         


        

Answer 1

Would an approach like this be feasible or useful?

public interface ICollidable
{
    void OnCollision();
}

public abstract class Body : ICollidable
{
    public abstract void OnCollision();
}

public class Dog : Body
{
    public override void OnCollision();
    {
        Bark();
    }
}

public Boolean OnCollision(ICollidable a, ICollidable b)
{
    b.OnCollision();
}