"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.

While growling shows less acoustic variances compared to barking, a study found humans to be successful in attaching specific emotions to growls, with women and dog owners excelling in the task.

Having the person enter, walk a few steps inside, and then leave. Then having the person enter, walk a few steps, approach ...