Since you weren't over feeding I'm thinking it's possible she may have been a severe allergy to a particular ingredient. Back in 2002 I had a bulldog who got severe diarrhea when I have her a lamb food. She ate 1 cup and I swear she pooped out 6. It looked very gassy and undigested. Like dog food whipped in a blender.
You could try a limited ingredient kibble that has fewer ingredients and see how she does. Get one that's close to the Iams you are currently feeding but with less fillers. I love Fromm but it really does have a large number of ingredients and that can make it tricky to figure out what the problem could be.
Sent from my iPhone 5 using Tapatalk![]()