Anytime you make a change in their diet they may have loose stools/diarrhea.
Unless it’s severe, I would give it a day or two, or three.
Some of those small breeds tend to develop bladder stones….so I would add water to her meals and choose her diet accordingly, high quality kibble, homemade, or a combination.
http://www.homeovet.net/dynamic/php/downloads/dog-c8470f2c75dbe4b683205c3919ee2310/dog_diet_complete.pdf
I like Wysong or Nutrisca (fish) as a dry food base. I have used Wellness in the past, my neighbor likes Fromm’s for her picky eater….I’m sure there are other good brands too.
