Dog-to-dog aggression is a complex behavioral problem with multiple causes, requiring accurate assessment and appropriate rehabilitation rather than blanket management or euthanasia.
Dogs showing aggression toward other dogs are typically experiencing fear, frustration, or arousal that they lack skills to manage. The welfare of aggressive dogs is often poor - chronic anxiety in social situations creates sustained stress. Rehabilitation that addresses the underlying emotional state through systematic desensitization improves both behavioral outcomes and individual welfare. The welfare of a dog who successfully learns to be calmer around other dogs is substantially better than one managed through permanent avoidance or social isolation.