Which tool is commonly used to assess pain in nonverbal animals?

• A. Blood pressure measurement
• B. Grimace scale
• C. Appetite scoring
• D. Heart rate alone

Answer: (B)

When animals cannot verbalize their pain, clinicians rely on observable signs to gauge discomfort. The grimace scale is designed for this purpose by focusing on facial expressions that change with pain. By scoring consistent facial cues—such as orbital tightening around the eyes, flattening or narrowing of the nose and cheeks, and changes in ear position (and sometimes whisker orientation)—we obtain a quantitative measure of pain intensity. This approach is quick, noninvasive, and has been validated across several species, making it a practical and reliable tool to guide analgesia.

Other options are less specific. Blood pressure can rise or fall for many reasons besides pain; appetite changes can reflect illness, stress, or metabolic issues; and heart rate alone is influenced by excitement, fear, medications, or systemic conditions. These factors can confound pain assessment, whereas a grimace score targets the immediate, pain-related facial signals to provide a clearer read on pain levels.