i would NOT DO THIS as while it is rare that fatty acids can cause pancreatitis it can so i would not take any chance with a pancreatic dog adding any fatty acid to their diet - i gave coconut oil to my allergy yorkie BUT NEVER my pancreatic yorkie even though others told me it was ok i will not chance it as it is still a fatty acid
so it is a risk and a dog that has had pancreatitis before is at a greater risk of getting it again very easily
here is the risk and the link
There are few side effects of fatty acid supplementation. At high doses, the most serious, but rare complication, is pancreatitis. This is an inflammation of the pancreas that can cause pain, diarrhea, vomiting, and dehydration.
Omega Fatty Acids: Sources, Effects, and Therapeutic Usesin Dogs