From Property to Family Member: A Legal Evolution

For most of legal history, companion animals were classified the same way courts classified furniture or a television set — as personal property assigned a monetary value and divided accordingly. If two people divorced, a dog or cat was simply allocated to one party, often based on who purchased the animal. Emotional bonds, daily routines, and the pet's own welfare played no formal legal role.

That framework is quietly but steadily changing. A growing number of jurisdictions have recognised that treating a living, feeling creature the same way a court treats a sofa is both scientifically outdated and emotionally inadequate. The shift reflects broader societal recognition of the human-animal bond and the genuine psychological impact that losing a beloved companion can have on both parties in a divorce.

U.S. State Legislation: The Pioneering Three

The United States has no federal pet custody statute, but three states have moved decisively ahead of the rest.

Alaska was the first U.S. state to explicitly require courts to consider the "wellbeing" of a pet when dividing it in a divorce, under legislation effective in 2017. Alaska courts can assign sole or joint ownership, giving weight to who has been the primary caretaker.

Illinois followed in 2018, amending its Marriage and Dissolution of Marriage Act. Under Illinois law, courts must consider the animal's wellbeing — not merely financial value — when awarding a companion animal. Joint ownership of pets is explicitly permitted, similar to how courts handle shared parenting plans for children.

California enacted California Family Code Section 2605, effective January 1, 2019. The statute directs courts to assign sole or joint ownership of a community property pet based on the care of the animal, and it permits judges to make temporary orders during the divorce process — meaning one party can be designated the caretaker while proceedings are ongoing. California's approach is notable because it uses the phrase "care of the animal" rather than "best interests," but in practice courts interpret this similarly.

In states without such statutes, pets remain legally classified as personal property. Courts in those states generally cannot order shared custody, though parties can agree voluntarily to sharing arrangements in their settlement agreements.

Spain: Sentient Beings Under Civil Law

Spain made a landmark change with Ley 17/2021, de 15 de diciembre, which amended the Civil Code, the Mortgage Law, and Civil Procedure Law to reclassify animals as "sentient beings" rather than objects. Before this reform, Spanish law treated animals as movable property (bienes muebles), meaning they were subject to the same division rules as a car or a piece of furniture.

Under the new framework, when a couple separates or divorces, Article 94 bis of the Civil Code requires the judge to determine the use and custody of the family's companion animals, considering the interests of all family members — including the wellbeing of the animal itself. Courts can award sole custody to one spouse or establish a shared custody arrangement with a visitation schedule, very much as they would for children. The reform explicitly prevents one party from simply claiming the animal as an asset to be sold or assigned an economic value in property division.

This is a significant cultural and legal milestone in Europe, and several other EU member states are observing Spain's experience closely.

Factors Courts Consider When Deciding Pet Custody

Whether a jurisdiction follows a statutory framework or a more informal property-division approach, certain practical factors recur in contested pet custody cases:

• Primary caretaker role: Who feeds the pet daily, administers medications, and maintains the pet's grooming routine? Courts in Alaska, Illinois, California, and Spain all look at demonstrated ongoing care.
• Veterinary records: Invoices, appointment records, and vaccination history showing who took the pet to the vet and paid for healthcare costs.
• Financial responsibility: Who purchases food, toys, training, and insurance? Financial records can establish who treated the animal as a primary dependent.
• Living situation: A party who moves into a small apartment with no outdoor space may be at a disadvantage for custody of a large, active dog compared to a party who retains the family home with a yard.
• Children's attachment: If children are also involved in the divorce, courts may try to keep the family pet with the children to ease the transition — an informal consideration that frequently influences outcomes.
• History of abuse or neglect: Evidence of animal abuse, neglect, or domestic violence (which often involves threats to pets) can be decisive.

Shared Custody Arrangements in Practice

Shared pet custody — sometimes called "bird's nest" arrangements where the pet stays in one location while the owners alternate — is growing in jurisdictions that permit it. More commonly, shared custody resembles a parenting plan: the pet spends alternating weeks or weekends with each party, and both agree on a single veterinarian and protocols for emergencies and major medical decisions.

Courts and mediators increasingly recommend written pet custody agreements that specify who is responsible for routine vet costs, who decides on elective procedures, what happens if one party wants to relocate, and how disputes will be resolved. Without such agreements, parties can find themselves back in court over relatively minor disagreements.

Pet Clauses in Pre-Nuptial and Cohabitation Agreements

The most effective way to avoid costly litigation over a companion animal is to address ownership before a dispute arises. Pre-nuptial agreements in most jurisdictions can include provisions about pet ownership — specifying who retains a pet acquired before marriage, how pets acquired jointly during the marriage will be handled, and whether financial compensation is appropriate.

For unmarried cohabiting couples — who in most jurisdictions have fewer legal protections than married spouses — a cohabitation agreement with explicit pet clauses is particularly valuable. These agreements can be drafted by a solicitor or attorney and, if properly executed, are enforceable contracts. They should address: who the animal is registered to, who is named on veterinary records, and agreed custody or rehoming procedures if the relationship ends.

Some couples are also using "pet prenups" even within marriage — a standalone agreement that predates or supplements the main pre-nuptial agreement and deals exclusively with companion animals currently owned or anticipated.

What This Means for Pet Owners Today

Even if you live in a jurisdiction that still classifies pets as property, the trend is unmistakably moving toward welfare-based considerations. Documenting your role as primary caretaker — through vet records, purchase receipts, microchip registration, and training enrollment in your name — builds a paper trail that will be relevant whether your jurisdiction has formal pet custody law or not. If you are in a relationship where a pet is shared, consulting a family law attorney early in any separation process, before custody becomes contested, is strongly advisable.