My recommendation is a fish and ancient grains kibble for dobies. It has a low fat protein, high in oils, and higher in carbs than some but not the kind of carbs that come from plain grains.
Nature's Logic - Distinction Sardine recipe (No filler, Healthy grains, legume and potato free, contains prebiotics and probiotics in its nutrient pack so you dont need to supplement)
Open Farm - Wild-Caught salmon & Ancient Grains (contains Salmon, pumpkin, healthy grains; legume/pea/potatoe free, great for skin and coat; I don tthink it has the same nutrient pack, so I do a pro/prebiotic powder sometimes cuz I feed this one)
I also recommend supplementing with freeze dried, maybe a pork or beef if chicken isnt agreeing with them. Never known a dog to have problems with freeze dried since its less processed (Stella & Chewy, SmallBatch, Primal, Bixbi, Green Juju, NZ Natural, Northwest Naturals, OC Raw, Vital Essentials)
I agree with the others recommending goats milk and/or kefir (Primal, Green Juju, Bones & Co, Answers), as well as a dash of pumpkin (Weruva makes nice pumpkin packets).
Something I highly recommend is HYDRATING the food. Dogs arent designed to eat nothing by dry stuff just like we aren't. Hydrating the food before it goes down into their belly can A. help them gobble it up slower, B. eat less and feel more full, C. ease stomach cramping or pain, and D. sometimes help with stool issues.
Hope those ideas give you some inspiration! Good luck!!