Understanding fear aggression in dogs. All dogs experience anxiety at some point, just as people do, it's a natural, even healthy emotion as long as it stays at a normal level. Left untreated, though, anxiety can grow to the point where a dog hurts themselves or someone else. Common causes: The three most common drivers are fear, separation, and ageing. Ageing itself can't be reversed, but fear and separation-related anxiety can almost always be helped, and often resolved, with the right treatment from an educated behaviourist. What fear aggression actually is: A fearful dog's first instinct is usually to avoid the perceived threat. Growling, barking or showing teeth typically comes before any bite, as a dog's way of avoiding physical confrontation if possible. Only when a dog feels cornered, unable to flee, does aggression become the last resort. Why punishment-based correction makes this worse: Positive punishment can suppress behaviour in the short term but can make the underlying problem significantly worse in fearful or anxious dogs. Getting the right support from an accredited trainer is essential for managing anxiety and fear aggression in dogs.