My one dog which is a Lhasa is a rescued dog and has next to no teeth, So I add water to his food to soften it. My other dog which is a Boston Terrier has decided he won't eat his food unless we put water in his food too. Could that upset a Boston Terriers stomach? My husband insists that is why the Boston has been having loose stool and accidents from the loose stool in his crate. Is adding water to the dry food harmful?