Aggressive behavior in dogs should always be taken seriously. Whether your dog is being reactive towards other people or dogs on a leash or protective over his food. Leash reactivity and aggression remain among the most common dog problems that are presented to qualified dog trainers.
Depending on the severity of the aggression and if your dog has a biting history, training might take a couple of months and won’t resolve on its own. To form an appropriate reaction towards an aggressive dog, you will first have to be able to understand canine body language and the type of aggression your dog might be showing.
Aggressive Dog Body Language
An aggressive dog will show distance increasing as well as dominant and agonistic signals. Signals can be more subtle or obvious depending on how much your dog feels threatened. The behaviors below all build up to an aggressive approach. Your dog might only show a few or all of these signals:
- Increase in body size
- Loud vocalization
- Snarling (bared teeth, retracted lips)
- Erect body posture
- Aggressive gape
- Head, neck, and ears are elevated
These behaviors display the initial phase of aggression. When the threat becomes more intense the dog may show a lowered body posture similar to submissive body language to protect the throat during an attack. The hair may be raised all the way down it’s back. Hair raised only on the shoulders and rump indicate fear instead of dominance.
The graphic below shows the typical signs of an agonistic aggressive dog:
Compared to a dog that is showing fear-induced aggression:
Fear induced and dominant aggression are both equally dangerous. Some dogs will also show a mixture of these two so it’s extremely important to educate yourself about subtle warnings.
Finding the Triggers
Now that you know what aggression looks like, you will need to find the triggers for your dog’s behavior. Write down every situation in which your dog shows any aggressive signs. Note the surroundings, people involved, sounds and smells.
This will also give you an insight into the type of aggression your dog is having which will be important to prevent future confrontations with these triggers.
Before your dog can be diagnosed with aggression, you should get him properly examined by the vet to exclude any medical issues that might cause aggression.
A dog that is in pain will growl at anyone trying to touch him. While this could include surface wounds, organic issues or joint diseases will often cause much more pain and aggression.
Dog on Dog Aggression
For some dogs, the mere sight of another canine might trigger inter-dog aggression. He might be lunging, growling and snapping at other dogs paired with a submissive or dominant body posture.
Dog on dog aggression is a result of a lack of socialization or trauma that might have occurred in his past.
The training goal will be to condition your dog to another behavior that he should be showing toward other dogs. Instead of lunging or growing, he should lay down or sit quietly. This conditioning will take time and a gradual approach by avoiding sudden confrontations with the trigger.
Fear Induced Aggression
Fear induced aggression can be directed towards humans as well as other animals. A fearful dog shows a tucked tail, ears laid back and a crouched position. Fear and anxiety occur much more early in a dog’s life as signs can be shown by the age of 8 weeks old while dominance aggression manifests after reaching social maturity (12-18 months old).
Fear is commonly triggered by a stranger approaching a leashed dog or a person suddenly reaching for the dog. Owners that have been living with this type of aggression usually tighten up and are filled with stress and anxiety which gets projected onto the dog.
Desensitization and building up your dog’s confidence will eventually resolve the aggression. If you want to learn more about this type of aggression continue on reading and check out this guide for more information.
A dog that is very territorial will show plenty of agonistic, defensive and offensive signals when strangers or animals approach the property. Territorial dogs don’t have to be aggressive but rather alert and wary toward strangers.
Uncontrollable aggression will result in injury if a person enters the property or fenced area. You might see the aggressive dog jumping on windows, doors or in a fenced yard trying to scare o
Restrainment with a leash, for example, might lead to displacement or redirected behavior towards objects, animals or people including the owner. The longer the person remains within the territory the more aggressive the dog becomes.
Conditioning your dog to associate the arrival of guests with something positive will eventually stop the aggression. Positive reinforcement training will be your best bet.
Possessive Aggression and Resource Guarding
Dogs can get possessive over objects, food and sometimes even people. Owners are startled when the dog suddenly growls at them when trying to put away a toy or walking by a filled bowl.
This type of aggression emerges from the early survival instinct of guarding resources and often results in food aggression. Refer to my blog post on how to stop food aggression for the different training steps.
Calming an Aggressive Dog
Calming your aggressive dog starts with noticing the warning signs we have talked about above. By always paying close attention to your dog’s body posture, you can’t get surprised by sudden aggressive outbursts.
If your dog gets uncomfortable and walks away from you or another person, give him space and don’t let him feel cornered. Avoid showing threatening behavior to an aggressive dog including:
- Not leaning over the dog
- Avoiding direct eye contact
- Turning your body to the side
- Not approaching the dog
You also cannot act like prey so running away or slouching into a ball will only make it worse. If possible, slowly move away from the situation and maybe restrain your dog in a closed room until it’s safe.
The most important thing to remember is to always remain calm. Startling a lunging dog with a loud scold may result in an attack. A calm demeanor testifies to strength and confidence, traits that will be respected by your dog.
Conquering aggression with aggression never works so you have to establish yourself as the ruling pack leader that communicates calm and nonthreatening behavior without backing down at the same time.
If your dog shows any signs of aggression on a leash, gently remove him from the trigger to build up the distance until your dog has calmed down. Ignore your dog’s bad behavior and don’t try to calm down a dominant dog with pets. If your dog is very fearful, massaging his pressure points will release stress and anxiety.
What to Do With an Aggressive Dog That Bites?
Severe cases of aggression with biting history should always be monitored by a dog trainer or veterinary behaviorist. A trainer will be able to provide you with a training plan and tips on how to correctly handle aggressive behavior.
Treatment for fear-induced aggressive dogs involves minimizing those situations that are most apt to induce fear. Desensitization paired with positive reinforcement work great on fearful dogs.
The trainer will be able to layout any stressors and classify your dog’s aggression into the following categories:
0 = growl/snap/stare, but no contact
1 = snap touches skin/clothing but not injury to the victim
2 = snap/bite leaving a red mark/bruise/torn clothing 3= single bite with puncture/large bruise/slash
4= multiple bites on the same occasion with punctures/bruising/slashes
5 = disfiguring bite that removed a chunk of flesh or multiple severe bites on the same occasion 6= bite resulting in death of the victim
Biting & Aggression Prevention
Prevention is the best way to stop any aggressive behavior that may result in a bite. If your dog has bitten before, putting a muzzle on him during the training phase will be mandatory.
Prevention starts early with the right socialization. Successfully desensitizing your dog to people, animals, places, sounds,
Avoid any known triggers that your dog has like walking by a loud construction site. Keep
What Not to Do
If your aggressive dog has a dominance issue the following things should be avoided and prevented:
- Never physically punish the dog rather ignore or redirect the behavior
- Do not give attention if solicited, play will only be engaged by you
- Do not feed your dog from the table rather lay the food into his own dish (table scraps are bad anyways)
- Do not allow the dog on furniture if he is showing signs of possessive aggression
- Play should only be calm, leave the room if it gets too rough
- Do not suddenly reach for the dog rather call him
- Do not disturb a sleeping dog
- Do not lean over your dog or corner him
- Do not turn your back or run away
It’s also extremely important to not punish growling or other warning signs. Your dog will only learn that the warning is an issue and the next time he will bite first. Early signs are extremely important for communication and should not be punished.