My girl Belle has consistently had hard stool for awhile now. She gets the same food as my other spoo but Princess’s stool looks absolutely normal. She eats normally but I don’t think she hydrates enough. She does drink but just not as much as princess. What can I add to her meals to encourage a softer more normal stool? I always mix their kibble with either water or bone broth to provide extra moisture. Her energy level is good and she seems otherwise healthy but I always watch their stool.