well i did the same thing as you as ultra z/d is SUPPOSE to be for allergies and ibd WELLLLLLL it was horrible as i fed all 3 of mine it and dex and demi itched like crazy on that food yet never have had a problem on any other food and my vet concurred as her dog itched like crazy on it and dermatologist concurred as she will not even sell it she thinks it is so bad. I am on an allergy dog group and it does work for some but what i saw is it stinks. If you read the ingredients it as foods dogs are allergic to. Derm said even if it is hydrolized some dogs especially allergy dogs can still pick up the allergent in the food.
I feed different foods and feed them separately 2 times a day and 3 for dex. I had to get to that point as they all have different needs
Dex is ibd and he has done well for 2 years on purina ha which is a soy hydrolized diet - soy is good for female dogs that are spay as well per our vet. Do i think it is the best diet in the world - nope but it works for dex and dee dee as well. I know soy can be an allergent but both do well on it includind dd. My concern was hypothyroid as soy can affect thyroid but dex was tested for hypot and came back fine and dee dee is hypothyroid but probably not tied to the food. It is an 8% fat diet.
White potato diets can be inflammatory but sweet potato is from a different night shade family so should be ok but if you had a prob before then i would just get them use to eating separately and feed the diets that work for them. I measure out now and everything as want them to stay at a good weight.
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