Read more here:Adult wolves use playtime to reinforce their dominance over puppies
European Commission: CORDIS
The findings [of the CANCOOP project funded by the EU were] published in the journal ‘PLOS ONE’ in May 2016 [and] refute the theory that adult wolves may soften their behaviour when interacting with puppies in order to encourage them to play. Instead, they maintain their dominant status.
http://cordis.europa.eu/news/rcn/125363_en.html