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Different Types of Dog Aggression

Aggression in Dogs

Types of Dog Aggression

Aggression is one of the main reason dogs are euthanised or rehomed. At least 30% of all dogs in rescue centre's are there because of the incidence of aggression in one form or another.

It is unusual to have a dog to have just one type of aggression normally they could have two or three,

Some aggression, especially if the dog is on the lead when they aggress at either humans or other dogs. Can be helped and checked by the use of a Jingler.

Try to imagine the Jingler as the opposite of a clicker. It tells the dog when it has done something wrong, rather than a clicker that says when it has done something right. 

I use this a lot with dogs that aggression the lead and this can transfer to off the lead if you use the Jingler coupled with the "OFF" command. It may surprise you to know that over-vaccination can cause aggression, as can neutering. The over-vaccination part link is at the bottom of this article. Check out neutering under articles for that information

 Most dogs have more than one of the following types of behaviour. It would be prudent before embarking on any program of aggressive behaviour modification, to rule out any medical reasons for that behaviour, especially if there is a sudden change in the dog’s temperament. 

There are some fifty-odd different medical reasons why a dog may be showing aggressive tendencies. These range from Pain, Thyroid Dysfunction, Epilepsy, Hypoglycaemia and Diabetes.One of the most important facts to remember is that all aggression should be treated as early as possible.Leaving it hoping it will get better is never the best option.

This is especially pertinent to puppies. Early onset aggression should be assessed and treated under the age of 16 weeks if possible. A dogs full personality, bite inhibition, and temperament is forming before this age. Therefore, treatment can in many cases be far more effective during this crucial time. 

This is only a part of the different types of aggression, because of the constraints of space it can only be a fleeting reference. I have covered fully “Food Guarding “and “Object and Possession Aggression” in previous articles in Dogs Monthly (one of the numerous magazines I have written articles for) 

Barking Noisy Pug

(1) Fear / Nervous Aggression (Interdog)
Often fear behaviour, has its roots directly to the pup’s mother. Breeders that breed from fearful and timid bitches will often make excuses as to why you cannot see the dam.

If you do view a litter of puppies and the mother is fearful then do not even consider buying a puppy. It is almost certain that the pups will inherit some of the mother’s traits through both genetics and socialisation.

 Genetically the pups may inherit her timidity and through the time they are with her will observe her fear and follow suit. Scientific research has shown that even pups that are born to a solid and stable mother and are then put with a bitch that is fearful.

Then they can pick up some of the unstable habits from the fearful dog, especially in weeks three through to seven. Other reasons for this fear type of problem is when a puppy or adult dog is attacked by another dog, especially whilst on the lead,

If the dog has no means of escape or is restricted from showing submissive body language to the attacker because of the owners actions and the lead. Then the dog can get a fear of dogs approaching whilst on the lead. .

If we then comfort the injured or frightened dog we only confirm that the fear is real and that will only make matters worse.Lack of early socialisation can also have a massive effect on this type of behaviour.

If the young pup, especially between the age of seven and sixteen weeks, is not carefully socialised with both adult and pups alike, Then they do not learn to “meet and greet” . The complex body language dogs learn at this age is crucial to their later behaviour, when they are approaching unknown dogs.

If they are unable to either perform or understand the greeting rituals, then they are immediately viewed with suspicion and conflict may arise. This especially so if they have not been socialised with puppies of a similar age. Hence, the requirement to attend puppy classes as soon as possible, from eight weeks of age.

With nervous and fear aggressive dogs, you will find that they will react similarly to any dog, regardless of whether it is male or female.  The behaviour is often worse if the dog is on the lead or is cornered, especially if close to the owner, who backs up the behaviour, (though unwittingly) by becoming nervous and agitated as another dog approaches.

This manifests itself in a tightening up on the lead and shoulders because of the expectation of conflict. Nervous owners also kick out a cloud of adrenaline that the dog instantly detects a causes it to look for what is causing the concern. It sees the dog approaching and reacts accordingly. 

This type of dog is also normally a barker, it will lunge and bark at the approaching dog but generally, will not snap, unless all its options have run out, ie flight or freeze and after all its threat posturing the other dog has still got too close.

This problem can often be diagnosed if someone who is confident around dogs (that the dog does not know well) takes it out on the lead. It will not get the same fearful vibes from the owner, therefore, the reaction to another dogs approaching will be less intense.  It is a good way of finding out if your dog suffers fear aggression as the behaviour will either not be exhibited or will be less pronounced. The owner can then use a desensitisation program for both the dog and themselves.

Aggression to humans is quite common and is normally fear rather than dominant aggression(2) Fear/Nervous Aggression against humans.
Once again, this can be caused by lack of early socialisation, bad breeding and sometimes non-existent or poor handling at an early age. Starting as young as two weeks old. Pups that are not handled gently and often by the breeder, do not get the strong olfactory and tactile bond with humans.

This is often the case with puppy farmed dogs and dogs born to large breeders. This handling at such an early age causes a mild stress response in the tiny pup, which benefits its ability to cope with many situations including people and dogs in later life. Nervous and fear aggression is always defensive in nature, sometimes it is related to the sex of the person.

If the breeder was female, and very few males visited or handled the puppies, then the timidity and fear may be worse with men. This particular problem like inter-dog hostility will manifest itself mainly with individuals rather than crowds. You will find that the puppy/dog will bark a lot but will be under a table or behind a settee.

The tail will be down and although it may seem overtly aggressive, the dogs balance and weight will be on the back foot not over the front feet. This demonstrates that the dog wants you to go away and is not always initially trying to bite or attack you.

A gradual and careful introduction to the stimulus that is causing the fear with positive reinforcement for calm behaviour is the way to overcome this type of problem though the dog will rarely make a total and full recovery and will never be the life and soul of the park parties.

(3) Frustration or Redirected Aggression
Research has shown that dogs who are not allowed to interact “normally” with people and dogs who were prone to displays of bad temper and behaviour that is overtly aggressive are dogs that are generally physically restrained or restricted from normal interactions (interactions with people, other dogs, and the outside world). The more the dog develops an intense desire to gain access to all of those things he desires. 

This desire can escalate into escape and roaming behaviour, agitation, biting and unprovoked attacks. It is often observed in dogs that are left tied up in flats, left in gardens, or near a window where they can see the things they want to interact with, but cannot get to them display unprovoked aggression.

To some extent the aggression showed to the postman is sometimes based on frustration. I have seen dogs attack their owner or a second dog in the home because it cannot get to the delivery man.

Sexual Dominance and Aggressive mounting(4) Sexual Aggression.
This type of aggression is usually limited to male dogs.  They will mount both people and other dogs.

Mounting activity directed towards humans may reflect a lack of opportunity for the dog to play with other dogs or an over-attachment to people in early life,

Mounting on other dogs especially if they initially try to put their heads over the other dogs necks can be related to rank and control complex behaviour.

Castration and behaviour modification can help with this problem. However be very careful, if the aggression is fear based rather than sexual then castration will almost certainly make if far worse.

Neutering removes vital hormones that are a confidence booster and serotonin up-lifters which are related to the feel-good factor.Allowing the dog to mate can often be recommended by the amateur dog expert, this would normally make the problem increase rather than decrease.

(5) Territorial Aggression 
This may be towards other dogs, people or both. By definition, territorial aggression should be directed toward members of the same species ie other dogs.

Domestic dogs, however, seem to regard humans as conspecific and consequently may direct territorial aggression toward us When dogs display aggression to strangers only on the home property garden, house, or yard, yet do not respond aggressively to strangers on neutral territory, then territorial aggression is the likely diagnosis. There are two primary motivations for territorial behaviour, control complex behaviour ie dominance or fear/anxiety. It may be worse in a small space such as a car than in an open area . Some dogs like this can be fine in the home, but not so good in the garden or yard.

Some breeds appear to frustrate much quicker than others, these are generally the working dogs such as Collies, Springer’s Cockers and some Retrievers The only answer to this problem is to work on the dominant/territorial problem in a way in which a dog understands its position through a behaviour modification program, using position reinforcement techniques.

Remember not to praise for the cessation of bad behaviour rather praise for that bad behaviour not happening in the first place. In other words, say the dog jumps up on someone and you say “OFF” if the dogs get off then do not praise, as you will be praising for the inappropriate behaviour, which was the jumping.

(6) Misdirected Aggression
dog aggression
Separating two dogs that are fighting can be dangerous as not all known methods are effective with every pair of dogs. Dogs fight at different intensities and for different reasons.

Learning how to avoid situations that can lead to a dog fight is better than having to break one up.

Frequently one or both dogs can misdirect their aggression towards the person attempting to break up the fight.

Whether this is considered to be a dog attack on a person, will depend on the circumstances leading up to the incident, and the actions of the person breaking up the fight and the past history of the aggressive dog.

Human hands intervening may not be seen as a hand but as another element of the original attack. People who try to break up fights between dogs are often the victims of what is called accidental or misdirected aggression.

This is quite a common situation, resulting in accidental bites from dogs that are otherwise wonderful, loving pets. Often it is a human, not a canine mistake that triggers the bite. And does not always signify or indicate that the dog is in any way dangerous or out of control.

Often dogs do not recognise their owners in these situations may bite them when they come too close.  Owners in other instances can accentuate a fight by intervening, as the dog will then fight not only to protect itself but also its owner. 

(7) Control Complex/Dominance Aggression
The initial approach to other dogs is often cautionary and contains many status signals, like tail carriage, held high and quickly moving from side to side, standing on tip toe etc. If the other dog submits, then all is usually fine, if not the fighting can be extremely noisy and in some cases quite severe. In both the last two examples, dominant and territorial aggression, I usually find the dog will pull quite badly on the lead. 

These dogs can also display aggressive tendency towards members of the family this could lead to an attack if not controlled in their early stages.  By working on a program  that will give the dog a purpose and a position in life almost a job and teach the dog to walk on a loose leash can sometimes overcome the problem. The type of program I would use is the NILIF program which stands for “Nothing in Life is Free” See my website under dominance

(8) Chase or Predatory Aggression. Predatory chase aggression
This can be directed at many things including dogs, cats, or anything that stimulates a chase response. Squirrels are a favourite, as their quick jerky movements seem to stimulate even the most placid of dogs.

I see a lot of predatory chase aggression in for instance Border Collies, in particular, stimulants like bikes, skateboards joggers and cars.

One of the key factors that distinguish predatory aggression from other forms of aggression is that movement often is the triggers . In the wild, this movement is in the form of running and escape attempts of small animals. Predatory behaviour can be seen in dogs of any sex and age.

Dogs that show intense interest and become aroused or anxious by the movement or noise of children or other pets should be closely monitored at all times. Prognosis is not good for this type of aggression. Reward based obedience training can help however this is only any use if the owner/trainer is able to constantly monitor the dog at all times.

It is easier to control the chase stimulus when it is directed at cars, joggers, or bikes. Two types of common treatment’s include counter-conditioning used to change the dogs’ perception of the falsely identified prey. Many also believe punishment works ie noise aversion when the behaviour is first stimulated.

Throwing water from a car window or sounding a rape alarm or air horn at the exact time the dog takes off, throwing down a plastic bottle of stones from a passing bike or car can sometimes alter this behaviour. However, these must be set professionally, by a behaviourist versed in aggressive behaviour. Most of the aversives need to be specially set using psychological stimuli;

However. To be effective, punishment must be seen as aversive and the timing of the punishment must be exact so that the dog associates the punishment with the behaviour. Electric shock collars have also been suggested but are not part of treatment programs I would normally recommend.

As mentioned aggression often has its origins in bad breeding, lack of socialisation, high prey drive, and poor basic training. However, as stated before it can be related to medical conditions and before embarking on a course of behavioural therapy, it may be prudent to have your dog checked over to see if there are no underlying medical conditions.

Learned aggression can normally be cured, however, hereditary aggression cannot, it can only be controlled and hopefully contained. Castration sometimes helps if the problem is hormonal, Please remember castration is male, not female dogs. Neutering female dogs that are showing aggression can often make the aggression worse. and should only be considered in an overall aggression reduction program.

Stan Rawlinson July 2003  
Regularly updated last update 2015


Vital Information For The Wellbeing of Your Dog and CatI have recently written what I believe is one of the most important articles on Annual Vaccinations.

It exposes the very real risk of over-vaccination of both dogs and cats. This vaccinating protocol could possibly cause allergies, cancer, serious illness or even death in our pets. Click the picture for more information.