I've been feeding my 4 month old GSD Wellness / Innova. She's been having soft runny stools for almost since we got her (at 8 weeks). I had tried Royal Canin first and she didn't seem to like that. So I got worried and took her to the vet, who did a stool culture and everything is normal. I guess it is the food that is leading to the runny stools. The vet gave me some prescription, high fiber food cans to add in with the kibble. Within one day of that, her stool has firmed up. So, I guess I should be looking for a higher fiber kibble. Any suggestions? Obviously what I'm feeding her is not working and she seems to have a really sensitive tummy. There are so many choices out there and I am totally lost about what I should be feeding her. Help!