I think I am more trained than Olivia is at 8 yrs old - trained to take her out every hour or so, that is!  She doesn't let me know she has to go, at all - ever.  It's totally up to me to take her out and see if she will go.  I attribute it to her being a retired breeder, where I was told she was trained to do her business in her crate.  Which she also still does!  But she's such a good girl otherwise...thank goodness!