Suppose you have toiled and slaved over a manuscript for the past two years. You have it polished, glossy and ready to send to the prom in a highly gown. Then, you're in B&N one day, you take a look at the shelf, and lo and behold, there's a book with a title almost exactly like your (unpublished) novel.
So you pick it up, read the book jacket. Good heavens, the plot is nearly identical, down to the first letters of the main character's names. Unnerved, you read the first page and think, "But, but I did it so much better! How dare this literary trollop steal my idea!"
Except, of course, you live in Pittsburgh and she lives in Saskatoon, so she couldn't have possibly stolen it. So the question is, what becomes of the poor unpublished book? Do you just have to sigh and trash it, or is it still open to shopping around?
Wait, you're willing to junk your novel when yours is better?
Are you insane?
Well, you clearly are, now that I think about it. The idea that Miss Snark would live in Pittsburgh is just...well... it boggles the mind. Not that Pitttsburgh isn't a nice place, full of Pirates and such but really.....they'd probably think it was weird to see a pink tammed poodle smoking a cigar and reading partials.
Change the title and the name, give it a polish, and full steam ahead. Those Saskatoonervillians won't know what hit 'em.