Animal pain is a sensory experience. It often prompts aversive behaviour, and it involves an awareness, of the animal, of damage, or the threat of damage, to its tissues. It prompts changes in the animal’s physiology and behaviour whose purpose is to avoid the damage, to reduce the likelihood of its recurrence and to promote recovery.

( Molony, V. (1997): Comments on Anand and Craig (Letters to the Editor). Pain, volume 70, p.293)
This animal is showing signs of pain and should according to the legislation be killed immediately. Photo: Anne Algers