Training and maintaining a service dog requires extensive time and financial resources. The emotional bond between service dogs and their handlers poses unique challenges when dogs develop behavioral issues. We present a case of an otherwise healthy adult service dog exhibiting acute environmental fears, hindering her job performance. The dog’s fear responses escalated in various settings, including school and home environments. Diagnostic evaluation ruled out medical pathology, leading to a diagnosis of nonsocial environmental fear and generalized anxiety. A multimodal treatment approach involving environmental management, antidepressant medication (fluoxetine), and behavior modification was implemented. Desensitization and counterconditioning protocols targeted specific triggers, such as shiny floors and elevators. Eight weeks after treatment initiation, the dog showed improvement, enabling a modified behavior treatment plan to be implemented as she gradually returned to work with reduced fear responses. Follow-up revealed sustained progress with additional dosage adjustment of fluoxetine.

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