For Better or Worse is a comic strip. The dog died at one point. This was very tragic for people who had read the strip since they were kids (unusually, the characters age in somewhat real time in this strip and have for years). It was kind of a controversy about how dare the author kill off such a beloved character (especially since she brought on a new replacement puppy).

I am guessing someone prompted Shea Weber having to comfort his daughter about having read this comic strip, and someone actually wrote them a story.