First I would like to thank Jessica Glass, Kristina Matschke, Andrea Pitsch, Katharina Trump, Stephan Gampe and Kathrin Schumann for helping with the data collection, with inviting dogs to the study and for general support. Thank you Mike Tomasello, for letting me conduct my thesis at the Max Planck Institute. A huge thank you to Juliane Kaminski, Esther Herrmann and Mike Tomasello for discussions, help and support. Specially thank you Juliane and Esther for all the help and support, you are great tutors! I’d also specially like to thank Susanne Mauritz for practical advice and support. Thank you, Linda Scheider for answering my questions. Thanks also to the computer personal and Ronny Barr at the MPI for helping me with computer issues. Thank you Roger Mundry for statistical advice.