umbilical hernias in dogs - anybody that has had a dog with that? a dog that has had issues/medical problems with it later on?

over here, we (usually) don't close them unless they're severe and Roky's wasn't so it just meant he wasn't going to be Mr Stud.it was considered a cosmetic fault.
but, a few days ago, I noticed it was swollen and now it's the size of an olive....