You bring home a new puppy, and your older cat suddenly becomes cold and distant. You stroke the neighbour’s dog during a visit, and your own dog nudges their way between you. You spend extra time on a video call and your cat walks deliberately across your keyboard, demanding attention. Are these moments of jealousy — or are pet owners projecting human emotions onto behaviours that have simpler explanations? The answer, as science has begun to reveal, is more complex and more fascinating than either camp expected.
The Debate: Anthropomorphism vs. Dismissal
For much of the twentieth century, animal behaviourists were deeply cautious about attributing human emotions to animals. Calling a dog “jealous” was considered anthropomorphism — projecting human psychology onto a creature that experiences the world differently. Under strict behaviourist frameworks, a dog nudging between its owner and another animal was simply competing for a resource (attention), not experiencing the complex social emotion of jealousy.
But a counter-movement has grown steadily. Researchers like Frans de Waal and Marc Bekoff have argued that dismissing animal emotions is its own form of bias — what de Waal calls “anthropodenial.” If we share evolutionary heritage, brain structures, and neurochemistry with other mammals, why would emotions be the one category of experience that stops at the human border?
The scientific question, then, is not whether pets feel something when a rival receives attention — clearly they do. The question is whether what they feel is meaningfully similar to human jealousy, or whether it is a distinct but related state that deserves its own description.
What the Research Shows
In 2014, a landmark study published in the journal PLOS ONE by Christine Harris and Caroline Prouvost provided some of the first experimental evidence for jealousy-like behaviour in dogs. In the study, owners were asked to show affection toward three objects: a realistic stuffed dog (that barked and wagged its tail), a children’s book, and a jack-o-lantern bucket. Dogs were significantly more likely to push between their owner and the stuffed dog than the other two objects. They also snapped or touched the stuffed dog more often when their owner was interacting with it.
Crucially, dogs responded most strongly to the stuffed dog — a realistic social rival — rather than to other objects receiving attention. This suggests that the behaviour was driven by something resembling social jealousy rather than a generic desire for attention.
Harris, who had previously studied jealousy in humans, noted the parallels. Human jealousy is typically triggered by a perceived threat to a valued relationship from a rival. Dogs appeared to respond most intensely to exactly this kind of perceived social threat.
The Neurological Foundation
Jealousy in humans is not a simple emotion — it involves a cocktail of threat perception, attachment, social comparison, and motivational drives. Whether dogs experience this full complexity is unknown. But the neural architecture for the basic ingredients is present. Dogs, like all mammals, have a limbic system — the emotional centre of the brain — including an amygdala that processes threat responses, and reward circuits driven by dopamine and oxytocin.
Studies using fMRI scanning on awake, trained dogs (a remarkable achievement in itself) have shown that dogs’ brains activate in similar ways to human brains when processing rewards, social cues, and familiar faces. The caudate nucleus — associated with positive anticipation and reward — is activated in dogs when they smell their owners. This suggests a neurological foundation for attachment, which is the soil from which jealousy grows.
Signs of Jealousy in Dogs
While the internal experience remains unverifiable, certain behaviours are widely observed when dogs perceive their relationship with their owner being threatened:
- Pushing between the owner and the perceived rival (another pet, a person, or even a phone)
- Attention-seeking behaviours that escalate when the owner focuses elsewhere
- Aggression directed at the rival — growling, snapping, or physical intimidation
- Destructive behaviour or “misbehaving” in ways that force the owner’s attention back
- Depression-like withdrawal, reduced eating, or lethargy when a rival receives sustained attention
- Following the owner more closely and becoming more physically demanding
Do Cats Get Jealous?
Cats are more complicated, partly because they are more independent and partly because their social motivations differ from dogs. Cats are not pack animals. Their attachment to humans exists on a spectrum — some cats are deeply bonded and highly sensitive to perceived threats to that bond; others are largely indifferent to sharing their owner’s attention.
What cat owners often describe as jealousy may include:
- Increased vocalisation, particularly when an owner is paying attention to another animal or person
- Inappropriate elimination — urinating outside the litter box can be a stress response to household changes, including the arrival of a rival
- Aggression toward a new cat or pet
- Withdrawal and sulking — a reduction in social behaviour that follows a change in household dynamics
- Over-grooming as a stress response
Whether cats experience the subjective emotional state of jealousy or whether these are purely stress-driven behavioural responses remains less studied than in dogs. What is clear is that cats are highly sensitive to changes in social relationships and household dynamics, and they communicate that sensitivity through behaviour.
Other Pets: Birds, Rabbits, and More
Parrots — particularly species like African greys, macaws, and cockatoos — are well known for what owners describe as intensely jealous behaviour. These birds form powerful bonds with specific individuals and can become aggressive, destructive, or dramatically attention-seeking when that bond is perceived as threatened. Given that parrots possess significant cognitive and emotional complexity, their jealousy-like responses are taken seriously by avian behaviourists.
Rabbits and guinea pigs, though less studied, also show signs of social jealousy when bonded pairs are disrupted or when one animal receives more attention than another. The social nature of these species means that perceived unfairness in resource distribution — including social resources like attention — can cause real behavioural distress.
Managing Jealousy in Multi-Pet Households
Understanding that jealousy-like responses are real and driven by genuine emotional states — not just “misbehaviour” — changes how we respond to them. Punishing a dog for pushing between you and a new pet is counterproductive; it addresses the symptom while increasing the underlying anxiety that produced it.
More effective approaches include:
- Parallel positive reinforcement: Rewarding both animals simultaneously so that the presence of the rival becomes associated with good things, not competition
- Dedicated one-on-one time: Ensuring each pet receives undivided attention daily, especially during periods of household change
- Gradual introductions: When bringing a new pet home, slow, structured introductions reduce the perceived threat
- Avoiding favouritism: Consistently including all pets in positive interactions reduces the sense of social hierarchy that triggers jealousy
- Enrichment: Ensuring each pet has independent sources of engagement and fulfilment reduces over-reliance on the owner as the only source of positive experience
“The dog that barks at your new kitten is not being bad. It is communicating something real about how it feels. Honour that communication by addressing the feeling, not just the behaviour.” — Dr. Ian Dunbar, veterinary behaviourist
The Broader Picture: Animal Emotional Intelligence
The study of jealousy in pets is part of a broader revolution in our understanding of animal emotional life. We now know that many animals experience grief, play, empathy, and fear in ways that are neurologically and behaviourally similar to human experiences. The old scientific conservatism about attributing emotions to animals is giving way to a more nuanced view: animals feel, they feel in ways related to but different from human emotion, and those feelings matter.
For pet owners, this has a practical implication. When your dog behaves badly after you welcome a new family member, or your cat stops eating after you spend a week away — these are not manipulative performances. They are emotional responses from a creature that has formed a deep bond and is experiencing something real. Treating them as such — with empathy, patience, and behavioural support — is the foundation of good pet ownership.
Conclusion
Do pets get jealous? The honest answer is: something very much like it, yes. Whether the internal experience is identical to human jealousy may never be fully knowable — but the behaviours, the neuroscience, and the evolutionary logic all point toward a genuine emotional response to perceived threats to valued social bonds. Our pets are not performing emotions for our benefit. They are feeling them. The least we can do is take those feelings seriously.
