I'm sorry.
It sounds like he is going to be okay.
Fat is not the only thing that can trigger pancreatitis. It is thought that certain ingredients and high protein foods can also.
Yup, I'd throw the bullies and Toothpicks away. Not good for pancreatitis patients and not good for dogs in general (jmo).
I'm not sure that Acana would trigger a pancreas issue, but now that it is weakened, he is much more susceptible to get it again. IMO, it is safest to skip it. Good idea to let your vet help you choose the food. for dogs that have had pancreatitis, esp. if a breed that is prone to it, it might be best to stick to rx food just because 1) these foods tend to be more consistent, 2) the protein and fat percentages are minimums, so you would have to contact every company if not rx to get the max percent, and 3) the ingredients used in GI foods tend to be agreeable to these pups.
My girl is on an 8% fat diet. Because of all her issues, when I homecooked her nutritionist decided on 1% fat. All depends on the pup... If you really want to feed an OTC food, then your vet could help you pick one. If they want Peanut on rx food only and you don't want to use it, then you can always talk to a nutritionist about homecooking.