Chill Protocol to Manage Aggressive & Fearful Dogs - Treatment at a Glance

Oct 12, 2026

Uploaded by aboduw

Chill Protocol is a home-administered medication plan designed to help manage dogs showing anxiety and/or fear-induced aggression before veterinary procedures. The protocol combines gabapentin, melatonin, and oral transmucosal acepromazine to reduce stress for both patients and owners and to enable safe handling for diagnostic investigation. A case of a 10-year-old German shepherd illustrates practical dosing timing, supervision needs, variable sedation duration, and successful progression from restraint-limited examinations to imaging and anesthesia.

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Physical Examination

Treatment at a Glance: Chill Protocol

Chill Protocol Overview

Medication Rationale

Outcome

CASE IN POINT h BEHAVIOR h PEER REVIEWED Chill Protocol to Manage Aggressive & Fearful Dogs Renata S. Costa, DVM, MPhil, MANZCVS, GradDipEd Alicia Z. Karas, DVM, MS, DACVAA Stephanie Borns-Weil, DVM, DACVB Cummings School of Veterinary Medicine at Tufts University Trotman, a 10-year-old, 100.3-lb (45.5-kg), neutered male German shepherd dog, was presented for oral examination after the owners noted blood in his mouth. No other apparent health problems were reported. Physical Examination The physical examination was limited due to fearinduced aggression, which was demonstrated by Trotman’s low body posture, tucked tail, growling, and lunging when approached by team members. His owners were able to open his mouth and allow visualization of a 2-cm mass in the buccal tissue atthe level of the right 3rd molar. Oral examination, thoracic radiography, abdominal ultrasonography, and resection/biopsy of the mass were recommended but could not be performed due to Trotman’s fear-induced aggression toward team members. Thus, the Chill Protocol* to be administered at home prior to Trotman’s follow-up appointment was prescribed to decrease patient and owner stress TREATMENT ATA GLANCE: CHILL PROTOCOL h Gabapentin (20-25 mg/kg PO) should be administered the evening before the scheduled appointment. h A combination of gabapentin (20-25 mg/kg PO) and melatonin (small dogs, 0.5-1 mg PO; medium dogs, 1-3 mg PO; large dogs, 5 mg PO) should be administered at least 1 to 2 hours before the scheduled appointment. h Acepromazine (0.025-0.05 mg/kg OTM) should be administered 30 minutes before the scheduled appointment. *The Chill Protocol is a relaxation protocol developed to manage fearful and aggressive dogs branded by the authors at Cummings School of Veterinary Medicine at Tufts University, where it has been routinely administered to dogs and cats prior to medical appointmentsand to facilitate anesthesia since 2014. OTM = oral transmucosal May 2019 [cliniciansbrief.com](cliniciansbrief.com) 63 levels and allow team members to safely handle the patient for diagnostic investigation of the mass. Chill Protocol The Chill Protocol is a combination of orally administered medications to facilitate procedural management of animals that exhibit signs of anxiety and/or aggression. The protocol consists of at-home administration of gabapentin, melatonin, and oral transmucosal (OTM) acepromazine (10 mg/mL injectable formulation) prior to a medical appointment (see Treatment at a Glance: Chill Protocol, previous page). Gabapentin and melatonin can be given with a small amount of food, and acepromazine should be administered oral transmucosally via syringe for mucosal absorption. Gabapentin has anxiolytic, sedative, analgesic, and anticonvulsive properties.1-5 Oral gabapentin causes anxiolysis and sedation in humans and reduces fear responses in cats.1-4 Although published data on gabapentin’s use for anxiolysis and sedation are lacking, anecdotal clinical experience TABLE CHILL PROTOCOL ADMINISTERED TO TROTMAN (100.3 LB [45.5 KG]) Drug Evening Prior to Examination (Dose) 1 to 2 Hours Prior to Examination (Dose) 30 Minutes Prior to Arrival for Examination (Dose) | Gabapentin | 1000 mg PO | 1000 mg PO | – | | --- | --- | --- | --- | | Melatonin | – | 5 mg PO | – | | Injectable acepromazine | – | – | 2 mgOTM | OTM = oral transmucosal supports its use. Melatonin is a naturally occurring hormone produced by the pineal gland. Exogenous melatonin has been shown to reduce pre-and postoperative anxiety in humans,6,7 and its calming effects and overall safety may benefit dogs with fear-motivated aggression and/or anxiety. Acepromazine elicits behavior-modifying effects (ie, tranquilization, sedation) in animals and has synergistic effects with other sedatives, anxiolytics, and opioids that produce calming effects.8,9 Trotman received gabapentin (22 mg/kg PO) the night before his follow-up appointment and a

FAQs

What is the Chill Protocol intended to achieve before veterinary visits?

It uses at-home administration of gabapentin, melatonin, and oral transmucosal acepromazine to reduce anxiety and aggression so team members can safely perform diagnostic and medical procedures while lowering patient and owner stress.

What medications and dosing timing are used in the Chill Protocol?

Gabapentin is given the evening before the appointment, gabapentin plus melatonin are given 1 to 2 hours before, and oral transmucosal acepromazine is given about 30 minutes before arrival.

How is sedation expected to affect the patient and what guidance is given to owners?

Sedation and weakness or incoordination may occur and require supervision. Sedation duration is variable and can last up to 24 hours, which is described as normal, while severe stress may cause longer-lasting harm.

Oct 12, 2026

Uploaded by aboduw