What does this nightmare mean?

I had this weird nightmare where I saw a dog outside in my garden attacking and raping my puppy. I ran outside with a bat for protection, it tried coming at me but I took a swing and hit the dog in the face which either seemed to kill it or knock it out cold. Then I ran to to my puppy and she was covered in blood, a horrible state. I was so sad. I don't remember much after that, think I woke up soon after. I was just relieved it was all just a dream and she's fine. Does it mean anything?