I had a dream similar to the movie I Am Legend…

I guess it was kind of weird and sad because the dream was sort of like the scene in I Am Legend where Will Smiths character kills the dog, except that it was me killing my dog. It was so real, it was horrifying. That my dog somehow got the virus and the only way was to kill her. And I wanted to cry but for some reason the tears wouldn’t come out. It must of been a while before I woke up but that dream disturbed me for a good day that I avoided my dog :(