Companion Animals

Dog Interdog Aggression: Assessment and Management

Aggression between dogs in multi-dog households or in social settings causes fear and injury; understanding the motivations enables effective management that protects all dogs' welfare.

Key Facts

Interdog aggression is one of the most common behavioral referrals in veterinary practice
Resource guarding, fear, and status-related conflict are common motivations
Spaying and neutering can reduce some forms of aggression but may increase others in individual dogs
Certified veterinary behaviorists achieve resolution or significant improvement in 70-80% of cases
Management strategies include baby gates, separate feeding areas, and parallel walking desensitization

Welfare Considerations

Dogs living with unresolved interdog aggression experience chronic stress and fear - even the dog that 'wins' fights lives in a state of vigilance that compromises welfare. Managing the household to prevent conflicts while working on systematic behavior modification protects all dogs. In some cases, rehoming one dog to prevent ongoing conflict is the most welfare-positive outcome for everyone involved.

What You Can Do

Separate dogs during feeding and high-value resource access to reduce guarding conflicts
Consult a veterinary behaviorist (DACVB) for professional assessment of serious interdog aggression
Never use punishment for aggression - it increases fear and escalation risk
Consider whether the dogs are compatible long-term and make humane rehoming decisions if needed