I'm not sure how much is in the canned z/d itself. But, she cannot have it alone. In fact either dry or canned alone causes her issues. But, with added fiber she does fine. Recently, she's having some slight weakness and I have to add the fiber so she doesn't strain too. It's insanity the combo of foods and the stuff I add has to be just so, too much or too little and she's having problems. I try to imagine if she had another owner them doing this. . .