have you recently changed foods or are in the process of? sometimes if you change foods too fast or feed two different brands it throws of their digestive system and give them the poops and an upset stomach for a couple of days. i would watch just to make sure it doesn't get watery. becasue then you are at risk for dehydration.   
there are also great hollistic measures to put in the food to stop soft/runny stools     
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