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Situational Aggression
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Some dogs are aggressive to all strangers, while others react in certain circumstances, such as when on a leash or chained, or while in an enclosed area such as a fenced-in yard. Some dogs may react if a stranger is moving quickly, such as running or on a bicycle, wearing a hat or odd clothing or depending on the stranger's size (adult or child).
Causes of Aggression
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According to Gary L. Clemons, DVM and author, reasons for aggression to strangers include lack of socialization, fear, hormones and genetics such as breed traits (guarding instinct) or unstable temperament.
Types of Aggression
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Dogs in cars are often aggressive toward strangers. According to Clemons, types of aggression include defensive, dominant, possessiveness, territorial and predatory.
Treatment
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For treatment, contact a veterinarian and have the dog checked for any possible illness or injury that may be contributing to the aggression. Ask the veterinarian for a referral to a dog behaviorist. Until the aggression is controlled, the dog should be kept muzzled or crated and away from strangers. According to the American Society for the Prevention of Cruelty to Animals, it is important to assess a dog's risk as an aggressor according to factors such as size, severity of the aggression, target and what triggers the aggression.
Warning
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Children are the most common victims of dog aggression. Owners of aggressive dogs can face the risk of jail, loss of home owner's insurance and financial losses.
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Dog Aggression Toward Strangers
Dog aggression toward strangers can be dangerous. Understanding the scope and probable cause of a dog's aggression may help the owner decide whether to try behavior modification or in extreme instances consider euthanizing the dog.