
I have owned 2 dogs with pancreatitis in 40 odd years of dog ownership.
My last bitch was on pancreatic enzymes for at least 7 years before I lost her. She was PTS shortly before her 17th birthday, so it shows that
correct treatment works.
People will often believe it's ok to give some extra or other if a dog has been doing well for some time. Then they grumble about a relapse. Once my girl was diagnosed, I was 100% about what I needed to do. She had no fat in her diet, and she had no treats, not ever. Her "treat" was a bowl of vegetables.
I can remember my vet saying that he believed that a dog should stay on enzymes once diagnosed. For him, it was just a gut feeling, but a year later, it was recommended in the veterinary press, so yes, it's a lifetime medication.