We used EWMN to describe 20 rollovers occurring in We used EWMN to describe 20 rollovers occurring in playful interactions containing rollovers from data set 1 to identify when and how rollovers occurred. Then, EWMN was used to describe 20 rollovers in play fights from data set 2 were also notated as an inde-pendent evaluation of whether the contexts identified for the use of interactions containing rollovers from data set 1 to identify when and how rollovers occurred. Then, EWMN was used to describe 20 rollovers in play fights from data set 2 were also notated as an inde-pendent evaluation of whether the contexts identified for the use of rollovers were common to a wider range of dogs. The categories of rollovers identified in this way were then subjected to quantitative analyses using the fuller data sets of available rollovers.