At the Hospital Clinic de Barcelona they use dogs to treat children with mental health problems. With over 100 years of history, the clinic is a leading public healthcare provider in Catalonia, committed to excellence in its 3 main areas: healthcare, research and teaching. Their 2-year study has shown the benefits of dog therapy. It allows to reduce 75% of emotional crises among children. This research will now study how teenagers between 13 and 17 years old react to playing with animals.