While neither of his parents were substance abusers, they were also normal dogs. It is possible that Brian's abnormal nature as a dog with human qualities may leave him with underlying identity issues, however. These issues may manifest as narcissistic personality disorder in Brian. The character has a strong sense of entitlement and feels superior to others. Yet his outcomes are seldom successful and this may in fact reinforce Brian's underlying feelings of inferiority. The fact that he is superior to other dogs but as a dog is inferior to humans is a potential root cause of narcissism but there is insufficient evidence for a full diagnosis.

Brian's behavior patterns represent abnormality in that he at times finds his drinking becoming an obstacle to achieving his goals, and because his drinking is a mechanism by which to medicate his underlying issues. At no point does the drinking actually help him...
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