How do I introduce our new puppy to our 2-year-old dog?

I agree, hold your puppy when introducing to your dog. BUT add a treat everytime you introduce the puppy. That way your dog will see your puppy as something positive and good. Never leave the puppy uattended or awhile during introductions until it is certain that a good relationship is established. (ie, slowly taking the treats out of the equation when bringing the puppy around.)