In the past 3-4 months, Anna, 12 yrs old,adopted 9 years ago, has diarhea and it is off and on.She will have ok stool and then for no reason that we can find, it happens again. Not blowout, but very soft and must go out 1 or 2 in the middle of the night. We have totally limited her food to her kibble with a bit of warm water, which she has eaten for all the years we have had her.We also tried adding rice, which seems to have no effect positive nor neg. Did a blood test=all normal. Did a parasite test with fresh stool=nothing found. So far she has lost about 5lbs, and weighs about 58 lbs which is still in normal range, altho I cannot put the lost weight back on her.The Vet say she is normal and healthy. So far we cannot find a reason. Any thoughts would be appreciated. we are fresh out of ideas.