my vet says low fat forever since Bunny’s* blood test showed her pancreas is barely in the the (high end) of normal after 2 weeks of prescription food (Royal Canin)
easiest thing is low fat dog food, of course, but I am hoping to eventually feed both my dogs a variety of commercial food/s and added food.
so, if they vet says “5% fat or less” - what is cooked chicken? white meat only? no skin?
Kayaker’s dog gets egg - but facebook folks say they give the egg white only.
I suppose there will be a lot of trial & error but I want to be on top of it: I saw how painful it can be. 
*Bunny is 11 1/2 and otherwise in OK health
A low-fat commercial food is a good start and a good continuing solution. Good commercial dog food is really all they need, but if you insist on adding to it, there isn’t much beyond white chicken meat (no fat, skin or bones) that’s that low in fat.
A number of makers make “weight control” foods that are less than 10% fat, if she can come to handle that. That’s well under most foods that are at 20-25%,
Ask your vet for options. I’m sure definitely at first it will be various prescription dog food brands. Another option would be for you to look into homemade food. But for this, you must do your research. Perhaps ask the vet to refer to a veterinary nutritionist, or find one in your area (do you live in a state with a veterinary school?). Since your doggie has special needs, if you go homemade, they’ll need some refinement, so it’ll be best to talk to someone well versed in nutrition that could help you. Or if you find a recipe that you think would work, pass it through your vet (or vet nutritionist) and see if it is sound and complete.
If you’re really just interested in non-prescription commercial, then you should ask the vet exactly what the guidelines are, and go to the pet food store aisle and start checking the labels. What fat% is she looking? What about protein and fiber? Dry or wet food? Get that information and then check the offerings available (I said pet food store because they likely have more (and better) brands than the regular supermarket offerings).
Not unless you have a very well-stocked pet store. Even the best don’t carry the “fringe” foods that border on prescription types.
Chewy.com is a great place to do research on a variety of foods, including obscure makers and minor varieties. If the maker has comprehensive nutritional analysis (and most better brands do), Chewy lists them, and you can always go to the maker site for confirmation and deeper info.
And Chewy.com is a great place to get your pet food at reasonable prices if a local store or vet doesn’t stock it or charges full price for specialty/special order.
(ETA: well,that came out sounding like an ad. It’s not. I went from having a good local pet store to having to drive a 40-mile loop for dog food, which led me to easier options. Chewy is extremely convenient and price-competitive, but I have absolutely zero connection to them except as a happy customer.)
thanks for the link, AB, I will check it out.