series of dots I didn't enter in document and cannot remove!

[Meenie50]

I have a document that I created a long time ago in Word 2003. I opened it in my Word 2016. There's a long dotted line across the bottom of the page that I can't get rid of. It shows in every view but I can't select it or remove it. If I select everything above it, when I put that info into a new document, the dotted lines come with it, even though I couldn't select them .
How do I get rid of this??