"My dog, specifically at nighttime, will randomly growl... I was just petting her gently, and she growled. Other nights, we will just simply move, and she will be lying in her crate, and she'll growl.

Source: SC Psychological Enterprises Ltd. When a dog growls it is sending a message. The main message is "I feel threatened, but I will defend myself if you come closer. Back off!" If a dog is acting ...