Animal Sentience in Policy & Law

From the EU's Lisbon Treaty to New Zealand's sentience bill — how science is reshaping animal law worldwide

A legal revolution underway

Recognizing animals as sentient beings is one of the most powerful levers in animal welfare law.

When law treats animals as mere "property" or "agricultural goods," welfare protections remain thin. When law recognizes animals as sentient beings — capable of suffering and positive experiences — it creates a foundation for much stronger protections. A global legal shift is underway.

2009 EU Lisbon Treaty formally recognizes animal sentience
2022 UK Animal Welfare (Sentience) Act — first standalone sentience law
2023 New Zealand expands sentience recognition to all vertebrates + some invertebrates
40+ Countries with constitutional or statutory animal sentience provisions
What sentience means legally

Why "sentience" matters in law

In philosophy and science, sentience refers to the capacity for subjective experience — particularly the ability to feel pain, pleasure, fear, distress, and other states that matter to the individual experiencing them.

Historically, law treated animals as property — objects that could be owned and used, with welfare protections granted only to the extent owners or legislators chose to provide them. The legal recognition of sentience changes the framework:

  • Sentient property vs. objects: Several jurisdictions now classify animals as "sentient beings" or "living beings" rather than objects, even while maintaining property law for ownership purposes.
  • Positive duties: Recognizing sentience creates positive obligations — not just to avoid cruelty, but to actively promote animal welfare.
  • Policy weighing: Sentience recognition requires policymakers to give animal suffering genuine weight when making decisions — including in areas not typically thought of as animal welfare (trade, agriculture subsidies, urban planning).
Landmark milestones

Key legal milestones worldwide

European Union — Lisbon Treaty (2009)

Article 13 of the Treaty on the Functioning of the European Union (TFEU) declares that animals are "sentient beings" and requires EU institutions and member states to "pay full regard to the welfare requirements of animals" when formulating and implementing policies. This was a watershed moment — embedding sentience into the constitutional framework of a bloc of 27 nations. It has been used to justify EU bans on battery cages, cosmetics testing, and more, and is the legal basis for proposed fur farming bans.

UK — Animal Welfare (Sentience) Act 2022

The UK's Animal Welfare (Sentience) Act 2022 is the world's first standalone law specifically establishing a government body to ensure that animal sentience is considered in all government policy. Key provisions:

  • Creates the Animal Sentience Committee — an independent expert body that reviews government policies for their impact on animal welfare.
  • Explicitly recognizes vertebrates as sentient beings. The government committed to extending this to decapod crustaceans (crabs, lobsters) and cephalopod molluscs (octopuses, squid) after the landmark LSE review confirmed their sentience.
  • Requires the Committee to publish reports on specific policies, creating public accountability.

The inclusion of crustaceans and cephalopods was particularly significant — the first major jurisdiction to legally acknowledge that invertebrates can be sentient and deserve protection.

New Zealand — Animal Welfare Act Amendment (2015, 2023)

New Zealand was an early leader: its 2015 Animal Welfare Act amendment declared that animals are sentient. In 2023, New Zealand further expanded its sentience framework to apply protections to all vertebrates and some invertebrates with sufficient evidence of sentience — including decapod crustaceans following the UK's lead.

France — Civil Code Amendment (2015)

France amended its Civil Code in 2015 to reclassify animals from "movable goods" (property) to "living beings endowed with sensitivity." This changed the legal framework within which welfare cases are argued and increased the weight courts give to animal suffering.

Switzerland — Constitutional Recognition

Switzerland's federal constitution recognizes animal dignity (Würde der Kreatur) — going further than most jurisdictions by establishing not just that animals are sentient, but that they have inherent dignity that must be respected. Swiss law prohibits treatment that violates this dignity, even in agricultural contexts.

Colombia — Supreme Court (2017)

In a landmark ruling, Colombia's Supreme Court declared a spectacled bear held in captivity a "subject of rights" — not a person, but an entity with legally enforceable interests. Several Latin American courts have issued similar rulings for great apes, elephants, and other cognitively complex animals.

The science behind the law

Scientific declarations on animal sentience

Cambridge Declaration on Consciousness (2012)

In 2012, a group of prominent neuroscientists at the Francis Crick Memorial Conference signed the Cambridge Declaration on Consciousness, concluding that:

"Non-human animals possess the neurological substrates that generate consciousness... The weight of evidence indicates that humans are not unique in possessing the neurological substrates that generate consciousness. Non-human animals, including all mammals and birds, and many other creatures, including octopuses, possess these substrates."

Signatories included Stephen Hawking. The declaration provided a scientific foundation for policy reforms that followed in subsequent years.

New York Declaration on Animal Consciousness (2024)

In April 2024, over 40 leading scientists signed the New York Declaration on Animal Consciousness, stating that:

"There is strong scientific support for attributions of conscious experience to other mammals and to birds. The empirical evidence also indicates that conscious experience is probably present in all vertebrates (including reptiles, amphibians, and fishes) and many invertebrates (including, at minimum, cephalopod molluscs, decapod crustaceans, and insects)."

This declaration — broader and more recent than the Cambridge Declaration — explicitly extends probable sentience to fish, insects, and crustaceans, directly supporting welfare law reforms for these long-neglected groups.

LSE Report on Invertebrate Sentience (2021)

A landmark review commissioned by the UK government and conducted by researchers at the London School of Economics concluded that crabs, lobsters, and octopuses are sentient, meeting eight of their ten criteria for sentience evidence. This directly led to the inclusion of decapod crustaceans and cephalopods in the UK's Animal Welfare (Sentience) Act.

Gaps and challenges

Where sentience law still falls short

  • Agricultural exemptions: Even where sentience is recognized, most countries exempt standard agricultural practices from welfare requirements. EU law recognizes animal sentience but still permits battery cages, gestation crates, and live transport that would otherwise violate welfare standards.
  • Fish and invertebrates: Despite scientific evidence, most jurisdictions still provide far weaker legal protections for fish, crustaceans, and insects than for mammals and birds.
  • Wild animals: Sentience recognition typically applies to animals under human control. Wild animals — the vast majority of sentient animals on Earth — receive almost no welfare protection from sentience-based law.
  • Enforcement: Many countries have strong sentience provisions on paper but weak enforcement capacity and penalties that fail to deter violations.
  • US lag: The United States has no federal recognition of animal sentience. The Animal Welfare Act (1966) does not cover farm animals, and the concept of sentience does not feature in US statutory law.
What you can do

Advancing sentience-based animal protection

Support federal sentience legislation (US)

Urge your US representatives to support federal recognition of animal sentience and reform of the Animal Welfare Act to include farm animals.

Support the Animal Legal Defense Fund

ALDF uses the legal system to protect animals, bringing cases that advance sentience recognition and fight animal cruelty.

Engage with Sentience Institute

Sentience Institute researches how moral circle expansion happens historically and what strategies most effectively advance animal protection.

Learn about fish sentience

Fish welfare is one of the biggest opportunities — 1 trillion fish are killed annually with almost no welfare consideration. See Fish Welfare for more.

Cite the science

When talking to people about animal welfare, citing the Cambridge Declaration and New York Declaration provides authoritative scientific grounding for the claim that animals can suffer.

Explore moral weight

Understanding how to weigh different animals' interests is key to effective advocacy. See Moral Weight for a deep dive.