Any ideas on how to get rid of them?

We saw 2 hanging out on our neighbors deck for the past week, which we thought was because they eat outside a lot. But now there were 3 on our deck and we don't eat outside! Our decks aren't large so they are maybe 8' from our sliding door and I'm afraid they are stalking our small dog (9 lbs) for dinner DS keeps telling me there are big birds outside!

**wasn't sure where to put this.