Animal welfare law has evolved from basic anti-cruelty statutes to sentience recognition frameworks over 200 years, reflecting shifting scientific understanding and moral progress.
The evolution of animal welfare law reflects an ongoing moral project. Early legislation targeted only egregious cruelty; modern frameworks increasingly require positive provision of behavioral and social needs. The recognition of sentience in law — the capacity of an animal to have subjective experiences — is a conceptual leap that changes the basis of welfare protection from preventing cruelty to acknowledging that animals have interests that law must protect. The trajectory is clear even if progress is uneven across countries and species.