Pierson v. Post is almost certainly the first case you'll read in Property, and there's a reason your professor opens with a dead fox. On its surface it's a petty squabble between two hunters. Underneath, it's the origin story of how the law decides that a thing becomes yours — and it hands you the single most important concept in the course: possession is the root of title. Nail this brief and you'll understand not just the rule of capture but the way courts choose between competing rules, which is the actual skill Property tests.

What did Pierson v. Post hold?

In Pierson v. Post (1805), the Supreme Court of New York held that merely chasing or pursuing a wild animal does not create legal possession of it. To acquire a property right in a wild animal (an animal ferae naturae), a person must actually capture it, mortally wound it, or otherwise deprive it of its natural liberty and bring it within certain control. Because Post had only pursued and nearly caught the fox while Pierson killed and carried it off, Pierson — not Post — lawfully owned the fox.

The Facts

Lodowick Post was hunting a fox with his hounds on a stretch of uninhabited, unowned beach land (a 'wild and uninhabited, unpossessed and waste land,' as the opinion puts it). Post found the fox, gave chase, and was in active pursuit with his dogs. Jesse Pierson, knowing that Post was hunting the fox, intervened — he killed the fox and carried it away for himself before Post could complete the capture.

The only legally significant facts are these: Post was pursuing but had not yet caught or wounded the fox, and Pierson intercepted, killed, and took physical possession of it. The land was unowned, so no landowner's rights complicate the analysis — the whole case turns on the acts of the two hunters. This is deliberate; the court wants a clean question about what act creates possession.

Procedural History

Post sued Pierson in a justice-of-the-peace court in an action of trespass on the case, arguing Pierson had wrongfully interfered with property Post claimed as his own. Post won at that level — the justice ruled for him. Pierson appealed to the Supreme Court of New York by writ of certiorari. That court reversed, ruling for Pierson. So the posture matters: the appellate court is deciding, essentially as a matter of law, whether Post's pursuit gave him a property interest the law would protect.

The Issue

The precise legal question: Does a hunter acquire a property right in a wild animal by pursuit alone, or is actual capture (or mortal wounding / deprivation of natural liberty) required to establish possession? Put in exam terms: what act is sufficient to reduce an animal ferae naturae to possession and thereby create ownership?

Holding & Rule

Holding: Pursuit alone is not enough. Post acquired no property right in the fox merely by chasing it, so Pierson — who captured it — was entitled to keep it. Judgment reversed for Pierson.

The rule (the part that goes in your outline): Property in wild animals (ferae naturae) is acquired by occupancy. Occupancy requires actually taking the animal — capturing it, mortally wounding it, or otherwise depriving it of its natural liberty so that escape is rendered practically impossible or the pursuer has brought it within certain control. Mere pursuit, no matter how diligent, does not vest title.

This is the rule of capture, and it's the phrase to know. Write it in your outline exactly this way: first possession = ownership; for wild animals, possession requires capture or mortal wounding, not pursuit.

The Reasoning (and the dissent you can't ignore)

The majority (Justice Tompkins). Tompkins reasons partly from authority — he canvasses old sources (Justinian, Bracton, Pufendorf, Barbeyrac, Fleta) on what counts as occupancy of wild animals. But the real driver is policy: the need for a bright-line, certain rule. If pursuit created rights, courts would drown in litigation over who spotted the animal first, who was closest, whose dogs were faster, and when a 'chase' becomes strong enough to count. A rule requiring actual capture (or at least mortal wounding that makes escape impossible) is easy to administer — either you have the animal or you don't. Certainty and the preservation of peace and order win.

Justice Livingston's dissent is the reason this case is famous, and your professor will make you argue it. Livingston (writing with characteristic flourish) argues that the law should reward the hunter's labor and effort. Foxes are 'noxious beasts' whose destruction benefits society, so the law should encourage hunting by protecting the hunter who has invested skill and pursuit. He would grant property to a pursuer who has a reasonable prospect of capturing the animal — someone in hot pursuit who has, effectively, all but won. His rule rewards useful labor and productivity rather than mere brute possession.

The majority-versus-dissent split is the whole point. It's certainty and administrability (Tompkins) versus rewarding labor and useful activity (Livingston). Neither is 'right' — they reflect different theories of why we recognize property at all. This is your first taste of the reality that Property doctrine is built on policy choices, not logical necessity.

Why Pierson v. Post Matters

Pierson is placed first for two reasons. First, doctrinally, it establishes the rule of capture — the baseline principle that possession creates property rights and that first possession wins. This runs through the rest of the acquisition unit: it reappears with escaped animals (ratione soli, the landowner's constructive possession), with natural resources like oil, gas, and water (the rule of capture is why you can 'drain' your neighbor's oil), and it frames the whole idea that property is a relationship between people, not between a person and a thing.

Second, pedagogically, it teaches you the meta-skill of 1L: reading a case for the competing policies, not just the holding. Your professor cares less about the fox than about whether you can articulate why the majority picked its rule and construct the counter-argument. Pierson is the training-wheels version of every policy analysis you'll do all year.

Cold-Call Prep: exactly what your professor will ask

This case gets grilled hard on day one. Come armed with answers to these:

1. 'What are the facts? What did each hunter actually do?' — Keep it to the operative acts: Post was pursuing with hounds; Pierson killed and took the fox before Post caught it. Don't ramble about the beach. The professor wants to hear you isolate the legally significant facts.

2. 'What's the issue?' — 'Whether pursuit of a wild animal, without capture, gives the pursuer a property right the law will protect.' Say it crisply.

3. 'What is the rule of capture? What does it take to possess a wild animal?' — Capture, mortal wounding, or otherwise depriving the animal of its natural liberty. Pursuit is NOT enough. Have those three formulations ready.

4. 'Why did the majority choose that rule? Why not protect the pursuer?' — Certainty and administrability; a bright-line rule prevents endless litigation over who was chasing first. This is the answer most students fumble because they think the case is 'about foxes.' It's about workable rules.

5. 'What does the dissent argue?' — You WILL be asked to become Livingston. He rewards labor and effort, protects the hunter in hot pursuit with a reasonable prospect of capture, and wants the law to encourage killing noxious foxes. Be able to make the argument, not just describe it.

6. 'Which rule is better?' — There's no right answer; argue both. Certainty (Tompkins) is easier to apply but may reward the interloper who does no work. The labor theory (Livingston) is fairer to the diligent hunter but invites litigation over 'reasonable prospect.' Professors love watching you hold both. Take a position and defend it.

7. The killer follow-up: 'Change the facts.' — What if Post had wounded the fox and it was staggering when Pierson grabbed it? (Now Post likely wins — mortal wounding can constitute possession.) What if the land had been Post's own property? (Now ratione soli may give Post constructive possession as the landowner.) Be ready to move the line.

On the Exam

Pierson rarely appears as a whole issue-spotter fact pattern, but the rule of capture is prime exam material and shows up in disguise. Watch for: escaped animals, oil and gas, groundwater, finders, and any question where two parties race for the same unowned thing. The trap is treating 'possession' as obvious. Weak answers say 'X possessed it' with no analysis. Strong answers state the rule of capture, then apply it: did this party actually capture / mortally wound / deprive the thing of its natural liberty, or did they merely pursue? Then, for the extra points, invoke the policy tension — certainty versus rewarding labor — exactly as Pierson frames it. If the fact pattern involves a diligent-but-thwarted party, that's your cue to run the Livingston argument. Professors reward the student who spots that 'possession' is a legal conclusion built on a chosen rule, not a fact.

Related Cases You'll See Alongside It

Ghen v. Rich — the whale case, where custom (marking a killed whale) supplies the possession rule, showing courts sometimes defer to industry usage over a strict capture requirement. Keeble v. Hickeringill — the decoy-pond case, protecting a landowner's productive use against malicious interference and adding the 'interference with livelihood' / ratione soli dimension. Together these three (often taught as a trio) let your professor test whether you understand that the 'right' possession rule depends on the policy the court is chasing. Later you'll connect Pierson to the rule of capture in oil-and-gas and water-rights cases.