Are all english bulldog's bodily fluid's?

like diarrhea or do they have normal stools my dogs is eating purana can that be the reason should i change it ? it's bad already because of how much they go and now i have to deal with this i have had her for 2 weeks it's been like this since i got her well it's a lil better i guess but not hard always very soft what should i do change her food?