When we think of canine aggression, we think of snarling, snapping, and other precursor behaviors that if not stopped, lead up to a bite.
Visitor comes to dog’s house, dog runs and barks, runs and barks. This can either be when the postal worker is on the front porch or if a visitor comes into the house, the dog barks, gets a little closer, backs up, and barks some more.
Would you label these behaviors as aggression?
Would the body language matter, as in the photo of the barking terrier vs. the barking Doberman?