Fluoxetine, a selective serotonin reuptake inhibitor (SSRI), is used to treat various behavioral disorders, including anxiety, aggressive behaviors, obsessive-compulsive disorders, and inappropriate urination or defecation outside the litter box. It is available in soft chews, tablets, capsules, and liquid forms, tailored to individual needs. However, it is contraindicated in animals allergic to fluoxetine or monoamine oxidase inhibitors. Veterinary supervision is essential to evaluate effectiveness and monitor side effects, especially appetite changes. Stored at room temperature, it should be used cautiously in cases of diabetes or epilepsy.