Which of the following is a sign of severe pain?

• A. Tooth grinding
• B. Vocalization
• C. Abnormal temperament
• D. All of the above

Answer: (D)

Severe pain in animals usually shows up as a combination of behavioral cues rather than a single clear sign. Tooth grinding can occur when the mouth or jaw is painful, signaling orofacial discomfort. Vocalization is a common distress response in many species when painful stimuli are present. Abnormal temperament—such as reduced activity, withdrawal, aggression, or unusual posture and hiding—also indicates that the animal is not feeling well. When pain is severe, these signs often appear together, increasing the likelihood that the animal is in significant pain. Because any one of these cues can point to pain and their combination strongly suggests high pain, the best answer is all of the above. In practice, clinicians and caregivers use multiple indicators over time to assess pain and determine the need for analgesia.