My dexter had severe pancreatitis and it was a lot of vomitting - no diarhea - was your pup vomitting if not then it was not pancreatitis
the test for pancreatitis is CPLI blood work as amylase and lypase enzymes do not necessarily determine pancreatitis. If your baby had a mild case of it then low fat diet for pancreas and low protein for liver issues. Ultra sound testing on pancreas is not really full proof either so true test is cpli but my experience is severe vomitting and it does not sound like yours had this.
Stay away from treats if your little one is having these kinds of signs now as if pancreatitis is severe enough like my dexter had they can die. We almost lost him at 2 and it cost us almost 10k over the past year with hospitalization and now he has inflammatory bowel disease as it was so severe it affected his small intestines. He had a plasma transfusion which saved him.