From 6 to 8 November 2017, the second training school of the European COST Action GroupHouseNet was held at the School of Agriculture of the Basque country in Spain. The training school aimed at providing high level training for PhD students and post docs on the topic of the relationship between prenatal and early life influences on the development of damaging behaviour in pigs and hens, to present their own research, and to discuss the latest science and make new European connections.