This is the first result when I googled about my dog having soft stool, so a couple of years after the end of the thread, I’m adding to it. I have a rescue Shih Tzu and she intermittently had soft stools from the time I got her a year and a half ago. It then became the norm back in October last year. I read up on it and decided to try the Diatomaceous earth and since I started putting it in her food every day, she has NOT ONCE had soft stools. It was extremely effective for me and I highly recommend trying it.