I’m so sorry you are going through this. I dont know if food allergies cause diarrhea or not, you may want to give the vet s call to discuss.
My boy has so many food allergies. We had him tested at the vet. It was a blood test by VARL
They actually give you a list of suggestions for food after they complete the test too.
The one I use now is by blackwood. It’s a catfish blend. He is allergic to chicken, lamb and too many other things to name.
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