My old dog Jake had pancreatitis when he was 11, brought on by a cocktail of antibiotics he was given to fight a persistent (and initially misdiagnosed) anal gland infection. They gave him injections on a Friday, I called the vet an hour later when he started throwing up, she said she would call me before her office closed to follow-up, but she neglected to do so.
I had to take him to the ER vet Sunday morning, or he would've died. I moved him to the regular vet Monday morning, and they released him on Friday. I visited him on Wednesday and he ate his first bites of food since getting sick from my hand. When it was time for me to go he pushed his little head against the kennel door, then he looked at me in difbelief, like "you're leaving me again?" It was the saddest thing, it was all I could do to make it to my car before crying my eyes out.
He lived to 15, but his appetite never fully returned. From that point on I had to make him fresh food, mostly turkey and chicken (with rice and vegies of course) and I had to give him a little canned pumpkin every other day to keep him regular. (He hated that part.)
Towards the end of his life he would only eat if I hand-fed him. Often if I was able to coax him to eat just a little tiny sliver, he would eat ravenously (for him, anyway.) When he refused to eat I gave him a nutritional supplement called Stat. (There are details in the giveaway section of this forum.)
I also had to monitor his hydration; my vet taught me how to administer lactated ringers subcutaneously... Poor little guy... I still miss him so much!
In any case I hope your doggie is feeling better soon! Pancreatitis isn't the end of the line, but it does make things a little harder. Our thoughts are with you.
-Mark, Jake and Brandy