A veterinary method for clinically modifying the behavior of a household pet dog exhibiting a recognized type of canine affective aggression behavior is provided. The veterinary behavior modification method administers at least one selective serotonin reuptake inhibitor compound to the dog upon one or multiple occasions; and the administration of these compounds will modify clinically the canine affective aggression behavior of the household dog permanently or for an indefinite period of time. This veterinary behavior modification method can be usefully employed as an adjunct to conditioning approaches presently employed and will avoid the need for euthanasia in extreme behavioral circumstances.
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