Yorkies are prone to pancreatitis and sausage and ham are two of the top triggers.
Watch him like a hawk and be prepared to rush him to the ER if he starts to vomit, has diarrhea, won't eat, etc. Pancreatitis is very serious and can even be fatal if it's not treated quickly.
Here are a couple articles for you so you will know what to look for:
Pancreatitis (Inflammation) in Dogs Pancreatitis