FI v DO Explained: What the Ruling Means for Pet Ownership Disputes

In December 2024, a family court in England handed down a judgment that shifted the conversation around pet disputes. The case, known as FI v DO, involved a disagreement over a dog between separating parties. The outcome mattered not because it created a brand new legal framework, but because of what the judge said and what that suggested about the direction of travel.

For years, the shorthand answer to pet disputes in England and Wales was simple: pets are property, so ownership style evidence usually decides the issue. FI v DO did not overturn that. What it did do was make it harder to pretend that a receipt, a registration record or a payment trail is always the whole story.

This matters in the UK, but it also matters more widely. Courts and lawmakers in several countries are now wrestling with the same basic question: when relationships break down, should a pet be treated exactly like any other asset, or should the animal’s day to day care and wellbeing carry more weight?

In short, FI v DO did not create pet custody law in England and Wales, and it did not stop pets being treated as property. What it did do was show that some courts may give more weight to caregiving evidence, not just receipts, registrations and payment trails.

Key points

• FI v DO did not create a new legal framework for pets in England and Wales.
• Pets are still legally treated as property.
• The ruling suggests caregiving evidence may carry more weight than many people assumed.
• Purchase records and registration still matter, but they may not tell the whole story.

What happened in the FI v DO case?

The case came before District Judge Crisp in the Family Court in England. At its heart was a question courts have struggled with for years: when two people separate and both want to keep a shared pet, how should that be decided?

Under the traditional approach, pets are treated as personal property. The obvious questions tend to be who bought the pet, who paid for the pet, whose name appears on the paperwork, and who can point to the clearest ownership trail.

In FI v DO, the judge looked more closely at the reality of care. Rather than treating financial ownership as the sole deciding factor, the judgment considered who had been the primary carer, what the pet’s daily life actually looked like, and the significance of the pet’s place within the household.

That is why the case attracted so much attention. It did not create “pet custody law” in England and Wales. It did show a court taking a more grounded view of what shared life with a pet really involves.

What FI v DO means in England and Wales

It is important not to overstate what the case did.

FI v DO is a first-instance Family Court decision. That means it is not binding on every future court in the way a higher appellate decision would be. Another judge could still approach a later case differently. Pets also remain legally treated as property in England and Wales.

So the case does not mean that the law has suddenly transformed overnight.

What it does mean is that caregiving evidence now feels much harder to dismiss. The judgment showed that at least some judges are willing to look beyond who paid on day one and focus more seriously on who has actually been doing the work of care.

That is a meaningful shift, even if it is not yet a full legal revolution.

The importance of District Judge Crisp’s approach

The significance of the case is really about judicial attitude.

For a long time, people involved in pet disputes were often told some version of the same thing: the law sees the pet as property, so the paperwork is what matters most. That framing encouraged people to focus almost entirely on receipts, registration records and purchase history.

FI v DO did not say those things no longer matter. It did suggest that they are not always enough on their own.

That matters because real life is rarely that neat. One person may have paid the original purchase price while the other person handled most of the walking, feeding, training, vet visits, medication and day to day routines. The case gave more weight to that lived reality than many people had come to expect from the property-based framework.

What the ruling does not do

It is just as important to understand the limits of the case.

It does not make pets legally equivalent to children.

It does not create a formal system of shared pet custody in England and Wales.

It does not mean the primary carer will always win.

It does not erase the relevance of ownership documents, purchase records, microchip registration or insurance details.

And it does not bind courts outside England and Wales.

In other words, this is not a total legal reset. It is a useful signal. It tells separating couples, mediators and lawyers that evidence of care matters and that some judges are prepared to take it seriously.

What evidence of pet caregiving actually counts?

Once caregiving becomes part of the conversation, the next question is obvious: what actually proves it?

A vague statement that you “did most of the care” is not usually enough on its own. The more useful the evidence, the more specific and contemporaneous it is.

That can include:

• a consistent care log covering walks, feeding, medication, grooming or overnight care
• vet records showing who attended appointments and authorised treatment
• payment records for food, insurance, grooming, prescriptions and routine care
• messages between the parties about the pet’s routine and needs
• records showing who arranged daycare, boarding or training
• evidence showing who the pet was mainly living with and who maintained day to day stability

This is one reason practical documentation matters so much. If your caregiving history only exists in your memory, it is much easier for someone else to challenge it. If it exists in records created over time, it is much easier to show a pattern.

Our guide to how to prove you are the primary carer for a pet goes further into the kinds of evidence that can actually help. It is also worth remembering that records around microchip registration, vet attendance and day-to-day care often work best when they point in the same direction rather than being treated in isolation.

Why this case has wider relevance outside the UK

Even though FI v DO is an English case, the wider issue is not uniquely English.

Across several countries, the old property-only model has been under pressure because it does not reflect how people actually live with pets. Dogs and cats are not treated by most families as interchangeable assets. They are part of routines, homes, children’s lives and emotional stability.

That does not automatically mean the law should copy child arrangements law. It does mean more legal systems are trying to find language that better reflects care, responsibility and welfare.

That is why this case has resonance beyond England and Wales. It sits within a broader international shift rather than standing alone.

Scotland, Australia, Canada and the United States

Scotland remains different from England and Wales, and readers should be careful not to merge the two systems. Pets are still generally treated as property under Scots law, and there has not been a Scottish equivalent of FI v DO creating the same kind of focal point. If you are based there, our guide to what happens to pets in a divorce in Scotland is the more relevant starting point.

Australia has moved further in legislative terms. Since 10 June 2025, family law courts there have had a more specific framework for dealing with companion animals in property settlements. That does not mean Australia now treats pets exactly like children, but it does show a legal system moving beyond the old assumption that a family pet should be dealt with in exactly the same way as any other asset.

British Columbia has also introduced a clearer companion-animal framework. Courts there can consider a list of factors relating to the animal and the parties, although the court still cannot make an order for joint ownership or shared possession. That is an important contrast. It shows how legal systems can recognise the special position of pets while still limiting what the court itself can impose.

In the United States, the picture varies by state. Some states have introduced legislation allowing courts to consider the wellbeing of the animal in divorce disputes. Others still apply a much more traditional property approach. The overall trend, though, is clear enough: more courts and lawmakers are acknowledging that caregiving and welfare should not always be ignored.

What FI v DO means for separating couples

The practical lesson from FI v DO is not “rush to court”. It is almost the opposite.

The case reinforces how valuable it is to document care properly and to agree arrangements before a dispute hardens. If you share a pet, you should not assume that love for the animal will be enough to protect your position later. Evidence and planning still matter.

That means keeping a clear record of what everyday care looks like. It means not relying solely on a microchip entry or a purchase receipt if the real story is more complicated. And it means recognising that prevention is usually better than arguing later about whose memory is more accurate.

If you are still together and planning ahead, a Petnup can help record your intentions while things are calm. If you are already separating, a Pet Parenting Agreement is usually the more practical tool for setting out what happens now. If shared care is part of the picture, it is also worth thinking about how that arrangement would work in reality, not just in principle.

What FI v DO really changed

The biggest change may be cultural as much as legal.

Before this case, many people assumed the answer to a pet dispute would always be brutally simple: show the receipt, show the microchip, show the insurance, and that decides it.

After FI v DO, that answer feels less certain. Not because ownership no longer matters, but because care now feels harder to sideline. The case gave more legitimacy to the idea that the person who has actually built the pet’s daily life may have a stronger claim than the paperwork alone suggests.

That matters for how couples plan, how mediators frame disputes, and how lawyers advise clients. It also fits the broader direction of travel in other jurisdictions, where the role of caregiving is becoming more visible rather than less.

Frequently asked questions

What is FI v DO?

It is a Family Court case in England that drew attention because the judge looked beyond simple ownership paperwork and considered the reality of caregiving.

Did FI v DO change the law on pets in England and Wales?

No. Pets are still legally treated as property, and the case did not create a new formal pet custody framework.

Does FI v DO mean the primary carer always wins?

No. The case suggests caregiving matters, but ownership records, registration and other evidence still remain relevant.

What evidence helps in a pet dispute after separation?

Useful evidence can include care logs, vet records, payment history, messages about the pet, and records showing who handled day-to-day care.

The bottom line

FI v DO did not rewrite the law of pet disputes in England and Wales. Pets are still legally treated as property, and the case is not binding on every future judge.

But it was still a significant moment.

It showed that a court can look beyond financial ownership and take primary caregiving seriously. It suggested that the lived reality of care matters. And it placed England and Wales within a wider international conversation in which more legal systems are beginning to recognise that family pets do not fit comfortably inside old property-only thinking.

That is why FI v DO has become an important reference point in discussions about pet ownership disputes after separation.

If you share a pet, the lesson is clear: document care, keep records, and do not assume that the paperwork alone tells the whole story.

Pawsettle is a pet documentation and planning tool, not a legal service. Nothing in this article is legal advice. If you are involved in a dispute over a shared pet, please consult a qualified legal professional. If you want to keep a clearer record of day to day care and create written plans for shared pets, Pawsettle can help you document both.