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Simple Summary  Pain recognition in calves is difficult. Pain is assessed either subjectively or objectively. Subjective pain assessment can be done using ethograms or pain scales, or by evaluation of changes of the facial expression due to pain. The problem with subjective pain assessment is that the evaluation of the amount of pain a calf is experiencing depends on the evaluation and the experience of the observer. Variables for the objective description of pain are assessment of biomarkers in the blood (e.g., cortisol or substance P), use of algometry to measure mechanical nociceptive thresholds, activity measurements by use of accelerometers and pedometers, use of infrared thermography, and the assessment of heart rate, heart rate variability, feed and water intake, or weight gain. Studies about pain recognition and pain management in calves mostly use more than one variable. Often a combination of subjective and objective measures is used to evaluate the level of pain calves are experiencing and to improve pain recognition.    Abstract  The evaluation and assessment of the level of pain calves are experiencing is important, as the experience of pain (e.g., due to routine husbandry procedures) severely affects the welfare of calves. Studies about the recognition of pain in calves, and especially pain management during and after common procedures, such as castration, dehorning, and disbudding, have been published. This narrative review discusses and summarizes the existing literature about methods for pain assessment in calves. First, it deals with the definition of pain and the challenges associated with the recognition of pain in calves. Then it proceeds to outline the different options and methods for subjective and objective pain assessment in calves, as described in the literature. Research data show that there are several tools suitable for the assessment of pain in calves, at least for research purposes. Finally, it concludes that for research purposes, various variables for the assessment of pain in calves are used in combination. However, there is no variable which can be used solely for the exclusive assessment of pain in calves. Also, further research is needed to describe biomarkers or variables which are easily accessible in the field practice.

Methods for Pain Assessment in Calves and Their Use for the Evaluation of Pain during Different Procedures—A Review