Are Pigs Intelligent? What the Research Actually Says

The Short Answer

Yes, dramatically — and the better question is “smart how.” Pigs perform well across most cognitive measures that have been adapted from primate and canine research: spatial memory, object discrimination, social learning, tool-adjacent problem-solving, and at least one form of self-recognition. That breadth is interesting on its own. What makes it more interesting is that pig intelligence is specifically pig-shaped — it solves the problems a pig is built to solve, in the ways a pig is built to solve them. The cognitive style is not a smaller version of a human or a dog.

The literature comes from a handful of research groups — Edinburgh’s Animal Behaviour and Cognition group, the Croney Research Group at Purdue, welfare-science teams at Bristol led by Suzanne Held, and Kristina Horback’s lab at UC Davis. Their work overlaps and disagrees in productive ways. What follows is a tour of the strongest findings and what they imply.

Problem-Solving and Learning

The most-cited finding in pig cognition is mirror-related.

Mirror Use vs. Self-Recognition

Broom, Sena, and Moynihan’s 2009 study in Animal Behaviour (DOI 10.1016/j.anbehav.2009.07.027) reported that after only five hours of mirror exposure, seven out of eight pigs successfully used a mirror reflection to locate a food bowl hidden behind a barrier — reaching it in a mean of 23 seconds by moving away from the image and around the obstacle. The result placed pigs in a small set of non-human species (great apes, dolphins, magpies, elephants) shown to interpret mirror information. Current welfare scientists describe this as mirror use rather than full mirror self-recognition in the strict primate sense (the hedge matters; the finding still does).

Operant Learning: Joystick and Touchscreen Tasks

Pigs also do well on touchscreen and joystick tasks. The Croney lab at Purdue extended earlier joystick work showing that pigs can learn to move a cursor toward on-screen targets and acquire new shape-matching rules across sessions — a level of operant learning comparable in shape, if not speed, to what dogs and some primates produce in the same paradigms. The finding people usually want to hear here is “pigs are smarter than dogs.” The honest answer is that cross-species intelligence comparisons are not what the research is designed to do; both species do well on tasks adapted to their ecologies, and a fair comparison would require tasks neither species was selected for. The comparison sells; the comparison also obscures.

Spatial Memory and Observational Learning

Memory and spatial cognition are well-documented. Pigs navigate foraging environments by remembering food-source locations and the time elapsed since they were last visited — a pattern Edinburgh’s cognition group has described in detail. They also learn from watching one another: a pig that has seen another pig solve a feeder problem solves it faster on first attempt than a pig that has not. This is standard observational learning — acquiring new behavior by watching a conspecific, the same capacity documented in corvids and dogs.

Emotional and Social Intelligence

Suzanne Held’s welfare-science group at Bristol has produced some of the most careful work on pig social cognition.

Emotional Contagion

Their long-running line of research looks at emotional contagion — whether one pig’s state (arousal, distress, or calm) is transmitted to another nearby pig, even when the second pig has no direct view of what is causing the first pig’s state. The cautious version of the finding is that pigs show measurable behavioral and physiological responses consistent with low-level emotional contagion, which is the foundation layer of what some researchers describe as empathy in non-human animals. Whether that meets the bar for “empathy” in the philosophical sense is a live debate; that pigs read each other’s states is not.

Individual Recognition and Personality

Pig social structures are individually-tracked, not anonymous. Pigs recognize specific other pigs across long separations and pick up where they left off in their relationships. They form preferences for some companions and aversions to others, and those preferences are stable. Horback’s UC Davis lab has documented individual personality differences in pigs — stable tendencies toward boldness, sociability, or caution that persist across contexts and time. The personality findings matter beyond curiosity: they make a behaviorally consistent individual a unit the welfare science can work with.

The temptation in this section is to over-translate the science into emotional shorthand — pigs have friendships, pigs feel grief, pigs love. The shorthand is partly true and partly not; the careful version is that pigs maintain specific relationships with specific other pigs, distinguish individuals at the level researchers can test for, and respond differently to a familiar pig than to an unfamiliar one. Whether the inner experience corresponds to what a human means by friendship is a question the research cannot fully answer. The research can describe the behavior, the physiology, and the patterns. The interpretation is the reader’s.

How Intelligence Shows Up in Daily Care

The most practical implication of the cognition research is that pigs need cognitive load the way other domestic animals need exercise. A pig with nothing to think about generates its own work, usually at the expense of fencing, infrastructure, or a caretaker’s patience. Rooting puzzles, foraging boxes, novel arrangements of the same objects, and predictable but non-rote routines all keep behavior inside the bounds of what daily care can absorb. An under-stimulated pig is not a calm pig; it is a pig about to solve a problem you didn’t want solved.

Trainability follows from the learning research directly. Pigs respond well to positive-reinforcement protocols — clicker training, target-stick work, station behaviors — at speeds comparable to dogs once a working reinforcer is identified (food, almost always; pigs are extremely food-motivated). The same intelligence that makes them trainable makes them resistant to coercive methods: a pig who has been punished does not generalize obedience; a pig who has been reinforced consolidates the behavior and extends it.

For first-time pig caregivers, the cognition research is the same body of evidence that drives the more practical expectation-setting elsewhere on this site. The Is a Pig a Good Pet? page goes deep on the household side of that picture, and the Mini Pigs Don’t Stay Mini page covers the breed-myth side. The cognition is part of what makes pigs rewarding to live with; it is also part of what makes them demanding.

What Does the Intelligence Mean?

The research can describe what pigs can do. It does not tell anyone what to do about what pigs can do. The question of whether cognitive capacity ought to change how we eat, how we farm, how we legislate, or how we organize our institutions sits one layer above the empirical work, and that layer is contested in ways the empirical work isn’t. Some readers will arrive at this section having already decided. Some will arrive having not decided. Both are doing the reading correctly.

What the research does usefully is foreclose one position: the older view that farmed animals were simply incapable of the kinds of mental states the question requires. That position is no longer scientifically tenable for pigs. What follows from rejecting it is the live debate — and it is a debate, with multiple defensible positions, not a settled answer. The companion pillar on Why Do We Eat Some Animals But Not Others? walks through the major ethical frameworks one position at a time without picking among them. Steampunk Farms does not pick among them here either.

Meet Some Pigs at Steampunk Farms

The science covered above is general. The pigs at Steampunk Farms are specific. Their bios are short on cognition research and long on the practical details of who they are. Their names, the rough shape of their stories, and a link to each full profile are below — read by hand for the individual versions of the patterns the labs measure in aggregate.

• Jute

  

  Jute is our charismatic pot-bellied ambassador who greets every visitor with the enthusiasm of a black and white tornado and the confidence of someone who absolutely knows he's the star of the show. This remarkable pig…

• Mo Love

  

  Mo Love is a magnificent force of nature who demands your full attention and isn't shy about claiming every square inch of space she deserves—including your feet, which she'll happily use as her personal recliner. This…

• Tashi & Hiro

  

  Tashi and Hiro are the ultimate sibling duo who prove that some bonds are absolutely unbreakable — despite sharing their spacious yard with 64 other pigs, these two are utterly devoted to each other and can always be…

Each lives now as a resident, not a research subject. Read their pages for the individual stories.