Table 1.

Criteria for behavioral pain-response scores (0–4)

Scoring	Level	Description
0	Normal behavior	No signs of discomfort
1	Slightly modified behavior	Rapid and shallow breathing, increased heart rate, immobility of hind limbs
2	Mild behavior	Restlessness, alertness, changed posture, tail wagging, head back to the abdomen
3	Moderate behavior	Tail wagging, head back to the abdomen, the back arching together with weight shifting, occasional grunting, and teeth grinding
4	Severe behavior	Head back to the abdomen, stomping feet or kicking the abdomen, repetitive back arching together with weight shifting, frequent grunting, and teeth grinding