Penelope hasn't had a firm stool since I got her. It's been almost firm, but never "normal." I thought it was the chicken food I had her on so I switched her to lamb. She still has stools ranging from soft to diarrhea. I mixed pumpkin in with her food and it helped a little, but as soon as the pumpkin's gone, the soft stools begin again. She's never had watery stools and she feels just fine, so I'm at a loss. Because she seems to have a sensitive stomach, she doesn't get any treats or people food. Will probiotics help? Can someone think of something else I should be doing for her?