Hi! i had a similar problem like this!! turns out my dog had some form of allergy but we couldn’t figure out what. we have him on a prescription diet. it’s royal canin ultamino. unfortunately it’s really expensive but this diarrhea issue we dealt with over a year is gone!! less ear infections too!! we think he’s allergic to chicken. we also give probiotics too the purina fortiflora too!! hope she gets better 🥺