When buying animal products, the welfare of farm animals is becoming of growing importance to consumers. Very few positive indicators of animal welfare are known. In cattle, social licking is regarded a promising indicator of positive emotions. Therefore, the aim of this thesis was to investigate if social licking in dairy cattle has a calming effect in terms of a reduction in heart rate on both the actor and the receiver, and whether this effect is dependent on the body region being licked. In the course of this study up to 24 Simmental cows were investigated for a total of 18 days. The animals were continuously observed using video recordings and their heart rate was measured. From the videos every licking bout was registered. Furthermore, for all social licking interactions the actor and receiver, the animals activity, the categories of social licking and the body region being licked were also determined. In total 370 licking bouts were used in the final analysis. Social licking caused a decrease in heart rate during the bout compared to the heart rate five minutes before in both the actor and receiver. After the grooming bout, heart rate significantly further decreased in the actor while in the receiver it tended to rise. The effect of allogrooming on heart rate differed between different body regions. Licking the dorsal, ventral and lateral neck, the withers or the rest of the body caused a significant drop of the heart rate in the actor during and/or after the bout. For the receiver, being licked on the head, the lateral and ventral neck and the rest of the body reduced the heart rate significantly. In conclusion, social licking has a calming effect on both the actor and the receiver. Nevertheless the use of incidence of allogrooming as an indicator for positive emotions in cattle is still not advisable. So far it is not clear if social licking is really a sign of good animal welfare or just a reaction to a tense and stressful situation in the herd.