I'm sorry Snoopy has this too! If it does become a chronic form, I have some experience with that! Paxil had an acute pancreatitis attack about 2 years ago that almost killed her. Her pancreas was damaged permanently and she has chronic pancreatitis now. It's why she sometimes refuses to eat for a few days. She has to eat a low fat diet for the rest of her life, no fatty treats, no table scraps. If you don't already know how, I highly recommend you learn how to do sub-q fluids and keep some at home! When Paxil refuses to eat, she gets some fluids for two days. If she still refuses, she's supposed to go to the vet on the 3rd day, but since I started doing the fluids at home, she hasn't had to go back!
I hope Snoopy is back to his usual self very soon!