I have tried giving her homecooking, which she did well on at first, but once I took away her Eukanuba, a day later she had Diarrhea...
Then I tried changing her from Eukanuba to Royal Canin in a week, I gave her a little bit more every time... Diarrhea...
I gave her Blue Buffalo with Eukanuba, she got Diarrhea...
No matter what I do, as soon as the Eukanuba isn't in her diet or added with something, she gets Diarrhea...