Companion Animals

Dog Interdog Aggression: Causes and Management

Aggression between dogs is a common welfare concern. Understanding triggers and management strategies helps keep all dogs safe and reduces household stress.

Key Facts

Interdog aggression can be resource-related, fear-based, territorial, or redirected frustration
Same-sex aggression is more common, particularly between unneutered males
Dogs rarely fight without prior warning signals that owners may miss
Serious injuries can occur in dog-dog conflicts, affecting both physical and psychological welfare
Behavior modification with professional guidance resolves many cases of interdog aggression

Welfare Considerations

Dogs living in multi-dog households where aggression occurs experience chronic stress that significantly undermines welfare. Even if fights are infrequent, the ongoing tension, hypervigilance, and fear can impact dogs' quality of life daily. Both the aggressor and the target experience poor welfare. Management strategies that prevent rehearsal of aggressive behavior, combined with gradual desensitization, offer the best outcomes.

What You Can Do

Separate dogs during high-risk situations such as feeding, greeting owners, or high arousal play
Consult a certified applied animal behaviorist for assessment before conflicts escalate
Avoid punishing aggression — it suppresses warning signals and can worsen underlying fear
Ensure each dog has its own space, resources, and individual attention
Consider whether the living situation is genuinely compatible for all dogs involved