What dog is NOT natural?  That’s what I’d like to know.

If your dog needs a laxative, it may as well be a natural one.  A natural dog laxative is, naturally, much more natural than a non-natural one.

Given that a laxative is something that helps get rid of constipation or otherwise helps move the bowels, it stands to reason that a natural dog laxative is a thing that is natural and that helps a dog go #2 more easily.