Understanding Aggressive Behavior In Dogs
Dog
aggression is any behavior meant to intimidate or
harm a person or another animal. Growling, baring teeth, snarling, snapping and
biting are all aggressive behaviors. Although
aggressive behaviors are normal for dogs, they’re
generally unacceptable to humans. From a dog's perspective, there’s always a
reason for aggressive behavior. Because humans and
dogs have different communication systems, misunderstandings can occur between
the two species. A person may intend to be friendly, but a dog may perceive
that person's behavior as threatening or
intimidating. Dogs aren’t schizophrenic, psychotic, crazy, or necessarily
"vicious," when displaying aggressive behavior.
Because aggression is so complex, and
because the potential consequences are so serious, we recommend that you get
professional in-home help from an animal behavior
specialist if your dog is displaying aggressive behavior.
Our Behavior Helpline can’t assist you with
aggressive behavior problems (see our handout: "When
The Behavior Helpline Can’t
Help").
Types Of
Aggression
Dominance
Aggression: Dominance
aggression is motivated by a challenge to a dog's social status or to his
control of a social interaction. Dogs are social animals and view their human
families as their social group or "pack." Based on the outcomes of
social challenges among group members, a dominance hierarchy or "pecking
order" is established (see our handout: "Dealing With Dominance In Dogs").
If your dog perceives his own ranking in
the hierarchy to be higher than yours, it’s likely that he’ll challenge you in
certain situations. Because people don’t always understand canine
communication, you may inadvertently challenge your dog's social position. A
dominantly aggressive dog may growl if he is disturbed when resting or
sleeping, or if he is asked to give up a favorite
spot, such as the couch or the bed. Physical restraint, even when done in a
friendly manner, like hugging, may also cause your dog to respond aggressively.
Reaching for your dog's collar, or reaching out over his head to pet him, could
also be interpreted by him as a challenge for dominance. Dominantly aggressive
dogs are often described as "Jekyll and Hydes"
because they can be very friendly when not challenged. Dominance aggression may
be directed at people or at other animals. The most common reason for dogs in
the same family to fight with each other is instability in the dominance
hierarchy (see our handout: "Canine Rivalry").
Fear-Motivated
Aggression: Fear-motivated aggression is a defensive reaction and occurs when a dog
believes he is in danger of being harmed. Remember that it’s your dog's
perception of the situation, not your actual intent, which determines your
dog’s response. For example, you may raise your arm to throw a ball, but your
dog, perceiving this to be a threat, may bite you because he believes he is
protecting himself from being hit. A dog may also be fearfully aggressive when
approached by other dogs.
Protective,
Territorial And Possessive Aggression: Protective, territorial and possessive
aggression are all very similar, and involve the defense
of valuable resources. Territorial aggression is usually associated with defense of property. However, your dog's sense of territory
may extend well past the boundaries of "his" yard. For example, if
you walk your dog regularly around the neighborhood
and allow him to urine-mark, to him, his territory may be the entire block! Protective
aggression usually
refers to aggression directed toward people or animals that a dog perceives as
threats to his family, or pack. Dogs become possessively
aggressive when
defending their food, toys or other valued objects,
such as Kleenex stolen from the trash!
Redirected
Aggression: This type of aggression is relatively common, but is a behavior that pet owners may not always understand. If a
dog is aroused into an aggressive response by a person or animal that he is
prevented from attacking, he may redirect this aggression onto someone else. A
common example occurs when two family dogs become excited, bark and growl in
response to another dog passing through the front yard. The two dogs, confined
behind a fence, may turn and attack each other because they can’t attack the
intruder. Predation is usually considered to be a unique kind of aggressive behavior, because it’s motivated by the intent to obtain
food, and not primarily by the intent to harm or intimidate.
Individual Variation
Dogs differ in their likelihood to show
aggressive behavior in any particular situation. Some
dogs tend to respond aggressively with very little stimulation. Others may be
subjected to all kinds of threatening stimuli and events, and never attempt to
bite. The difference in this threshold at which a dog displays aggressive behavior is influenced by both environmental and genetic
factors. If this threshold is low, a dog will be more likely to bite. Raising
the threshold makes a dog less likely to respond aggressively. This threshold
can be raised using behavior modification techniques.
How easily the threshold can be changed is influenced by the dog's gender, age,
breed, general temperament, and by whether the appropriate behavior
modification techniques are chosen and correctly implemented. Working with
aggressive dogs can be potentially dangerous, and should be done only by, or
under the guidance of, an experienced animal behavior
professional who understands animal learning theory and behavior.
What You Can Do
- First check with your veterinarian to rule out medical causes for
the aggressive behavior.
- Seek professional help. An aggression problem will not go away by
itself. Working with aggression problems requires in-home help from an
animal behavior specialist.
- Take precautions. Your first priority is to keep everyone safe.
Supervise, confine and/or restrict your dog’s activities until you can
obtain professional help. You’re liable for your dog’s behavior.
If you must take your dog out in public, consider a cage-type muzzle as a
temporary precaution, and keep in mind that some dogs can get a muzzle
off.
- Avoid exposing your dog to situations where he is more likely to
show aggression. You may need to keep him confined to a safe room and
limit his people-contact.
- If your dog is possessive of food, treats or a certain place, don’t
allow him access to those items. In an emergency, bribe him with something
better than what he has. For example, if he steals your shoe, trade him
the shoe for a piece of chicken.
- Spay or neuter your dog. Intact dogs are more likely to display
dominance, territorial and protective aggressive behavior.
What Not To Do
- Punishment won’t help and, in fact, will make the problem worse. If
the aggression is motivated by fear, punishment will make your dog more
fearful, and therefore more aggressive. Attempting to punish or dominate a
dominantly aggressive dog is likely to cause him to escalate his behavior in order to retain his dominant position.
This is likely to result in a bite or a severe attack. Punishing
territorial, possessive or protective aggression is likely to elicit
additional defensive aggression.
- Don’t encourage aggressive behavior.
Playing tug-of-war or wrestling games encourages your dog to attempt to
"best" you or "win" over you, which can result in the
beginning of a dominance aggression problem. When dogs are encouraged to
"go get 'em" or to bark and dash about
in response to outside noises or at the approach of a person, territorial
and protective aggressive behavior may be the
result.
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