Princess got pancreatitis last July-ish & has been on Science Diet's i/d ever since, per vet instructions. We think it may be triggering some allergies so I may reluctantly switch to another G.I. sensitive formula. I'm still trying to weigh the pros & cons of changing since the 'allergies' aren't always that bad. I do plan on keeping her on something similar to what she's on now for life. It doesn't mean she'll never get sick, but it does reduce the chances. After she vomited 10-15 times in mere hours (about 12) & almost losing her to dehydration I'll
never risk it again. Too scary & it's not worth the risk by any means for me.
She still gets some human treats but they are plain veggies & fruit, as well as Gerber puffs, all approved by her vet. If I ever want to try something new I call the vet. They all know our names & story very well.
I know some dogs have gone back to their original diets, but I've decided to err on the paranoid side of caution. Overall, I'd probably go with what your vet says as well as doing your own research.
Good luck! Hope your baby's doing well very soon!