Why the dog becomes aggressive

There are no aggressive dog breeds by DNA, but it all depends on socialization, how the dog is raised, the environment in which it lives, and its experiences.

In general, there are some breeds predisposed for guarding and protection functions that can have a tendency towards aggression, and they are:

Then, more than DNA, what matters is how we train the dog, what its psycho-physical conditions are, and starting from there to answer the question: "Why has my dog become aggressive?"

Fear or anxiety

These are two very common emotional states that provoke strong, and therefore aggressive, reactions. A dog can become aggressive when he feels threatened, for example, in new or unfamiliar situations, when he's unsure of what's happening around him. If proper socialization is lacking in the first few months of life or the pet has experienced traumatic experiences, unexpected fear-related reactions are more common.

mistreatment

A dog that is abused, neglected, or exposed to trauma can develop aggression due to mistrust toward humans or other animals. Abused dogs live in a state of constant hyperalertness, and chronic fear alters their nervous and hormonal systems: it increases cortisol (the stress hormone) and reduces their ability to control impulses. This results in the dog reacting with bites, growls, or attacks to protect itself, even in situations that would normally not be threatening.

Defense of the territory

Some dogs are particularly protective of their territory, which may include their home, yard, or their human. A territorial dog may react unexpectedly toward people or other animals they consider a threat to their space. When someone enters their space without permission (house, yard, fence), the dog may growl, bark, or try to chase the intruder away. This behavior is defensive, not offensive: the dog wants to protect what it considers "its."

Defense of food and objects

When a dog feels threatened while holding something he considers valuable, such as food, a toy, or even a person, he may become aggressive to protect what he considers his. This is a natural behavior, called "resource guarding(resource defense) and can become a form of aggression if the dog perceives a threat to his belongings. It's not malice, but a protective instinct linked to survival.

Stress and frustration

Stress activates the sympathetic nervous system, increasing cortisol and adrenaline, and a stressed dog becomes more reactive, nervous, and less tolerant of stimuli. Even stimuli he would normally ignore (noises, people, other animals) can trigger growling, barking, and defensive biting. Dogs left irresponsibly to laze around and lacking sufficient physical exercise or mental stimulation become frustrated, which can lead to unwanted behaviors, including impetuosity and aggression.

Health problems

Injuries, arthritis, dental disease, or infections can cause a dog to react aggressively when touched or approached. Even minor pain can lower their tolerance threshold, leading to growls, snaps, or defensive bites.

What to do when a dog becomes aggressive

When a dog becomes aggressive, the owner has a duty to ensure the safety of the people living in the home and those with whom the animal comes into contact. These are matters that cannot be overlooked, and can lead to serious accidents.

The most important things to do are these:

Use leashes, barriers, or fences when you cannot directly monitor your dog.
If the aggression is sudden or unusual, take him to the vet to rule out pain or medical problems.
Don't yell or make sudden movements: this will increase the dog's stress.
But speak in a firm, calm voice: it helps reassure him.
Hitting, jerking, or punishing your dog can make fear and frustration worse.
If your dog growls or shows signs of stress, walk away slowly and give him more space than usual and a safe place.
These are all warning signs of dog aggression: growling, bared teeth, stiff posture, tail held high, ears back.
If the aggression involves food, objects, or territory, never forcibly remove what the dog is defending.

Why does the dog become aggressive?