The modern animal welfare movement has roots in 18th-century philosophy and 19th-century legislation, evolving through scientific understanding and social change into a global force.
Progress in animal welfare has been driven by a combination of scientific evidence, philosophical argument, and public advocacy. Early legislation focused on preventing cruelty to horses and cattle visible in urban streets. Factory farming's rise in the 20th century demanded new frameworks for hidden, industrial-scale suffering. The Five Freedoms provided the first systematic welfare standard. Singer's utilitarian case for animal liberation expanded moral consideration. Today's movement increasingly focuses on systemic change through corporate campaigns, legislation, and technological innovation.