High-dose oral pentobarbital can produce anesthesia in aggressive dogs prior to euthanasia.

Oral pentobarbital (≥255 mg/kg) can induce unconsciousness in aggressive dogs but cannot reliably cause death alone.

This prospective study evaluated whether oral administration of pentobarbital sodium at three times the labeled intravenous dose could induce unconsciousness or euthanasia in dogs scheduled for euthanasia in a shelter setting. Twelve dogs exhibiting human and/or animal aggression were enrolled between June 2024 and October 2025, with no restrictions on breed, sex, or age. Pentobarbital sodium solution was placed into size 00 gelatin capsules (1-mL capacity) and concealed in high-reward foods. Nine of 12 dogs consumed the food, while 3 refused. Of the 9 dogs that ingested the drug, 5 achieved unconsciousness at a dose of ≥255 mg/kg within a mean time of 25 minutes. Respiratory rates remained slow but consistent throughout the 120-minute observation period. Critically, none of the 12 dogs achieved death solely from oral pentobarbital administration, and all required a secondary euthanasia method. The findings indicate that oral pentobarbital is unreliable as a standalone euthanasia agent in dogs. However, at doses of ≥255 mg/kg, it demonstrated utility as a pre-euthanasia anesthetic in behaviorally challenging dogs where safe handling is compromised. This technique may offer a practical, lower-stress option for veterinary and shelter personnel managing aggressive dogs prior to euthanasia, though acceptance of the food vehicle remains a limiting factor and an alternative euthanasia method must always be available.

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