From Wikipedia "Law 32/2007 provides that the government will take measures to ensure that farm animals are not caused unnecessary suffering, and was enacted in order to comply with European Union requirements on farm animal welfare. " https://en.m.wikipedia.org/wiki/Animal_welfare_and_rights_in_Spain so while this law doesnt address farm animals other laws do. I cant comment on application or enforcement but it is usual to have different laws related to farm animal welfare and domestic animal welfare since the issues are often different in each case.