Here is an email from my son tonight sent to me on Dudley


It looks like this coil surgery is for shunts that are inside the liver. it's possible this might be, but most of the time these small dogs have them outside the liver.

http://vetsurgerycentral.com/pss.htm

This is the best site that I've seen that describes it. Likely, they'll put a ring on the shunt like you see in this site. As long as they find it (the shunt), it shouldn't really be too bad of a surgery. It just depends on the shape his liver is in.