Do Dogs Grieve? The Science Behind Dogs, Grief, and Loss
Explore the science of dogs grief loss: research findings, evolutionary roots, physiological mechanisms, and how to support a mourning dog.
Do Dogs Experience Grief?
Yes — dogs do grieve. Research published in peer-reviewed journals confirms that dogs exhibit measurable behavioral and physiological changes after losing a companion animal or human caregiver. While canine grief doesn't mirror human mourning exactly, dogs display withdrawal, appetite loss, vocalization, sleep disruption, and elevated cortisol levels following a significant loss. These responses are rooted in their neurobiology and evolutionary history as deeply social animals. If your dog is grieving, understanding the science behind their behavior is the first step toward helping them recover.
The Research: What Studies Tell Us About Dogs and Grief
For decades, the question of whether dogs experience grief was dismissed as anthropomorphism — humans projecting emotions onto animals. But a growing body of research has shifted that consensus.
A landmark 2016 study published in Animals (an MDPI journal) surveyed 426 dog owners who had lost one dog from a multi-dog household. The findings were striking: 86% of surviving dogs exhibited behavioral changes consistent with grief, including increased clinginess (74%), reduced play (63%), increased sleeping (35%), and decreased appetite (32%). These changes lasted anywhere from two weeks to over six months.
A 2022 follow-up study by researchers at the University of Milan went further, measuring salivary cortisol levels in surviving dogs after the death of a canine housemate. Dogs showed significantly elevated cortisol — the primary stress hormone — compared to baseline, confirming that grief isn't just behavioral but physiological. The cortisol spike was most pronounced in dogs that had a strong affiliative bond (frequent play, resting together, mutual grooming) with the deceased companion.
Research from the ASPCA also documents separation-related distress in dogs who lose human caregivers, noting symptoms that overlap with clinical separation anxiety: pacing, destruction, vocalization, and refusal to eat.
Key Research Findings at a Glance
| Study / Source | Sample Size | Key Finding |
|---|---|---|
| Uccheddu et al., 2022 (University of Milan) | 426 dog owners surveyed | 86% of surviving dogs showed grief-related behavioral changes |
| Cortisol analysis sub-study, 2022 | 22 dogs measured | Salivary cortisol significantly elevated in grieving dogs with strong bonds |
| ASPCA behavioral reports | Ongoing case data | Dogs losing human caregivers show separation-anxiety-like symptoms |
| Horowitz Dog Cognition Lab, Columbia | Various studies | Dogs form attachment bonds comparable to infant-caregiver bonds |
Why Dogs Grieve: The Evolutionary Context
Evolutionary roots: Grief-like behavior in dogs traces back to their wolf ancestors. Wolves live in tightly bonded family units where cooperation is essential for survival — hunting, pup-rearing, and territory defense all depend on group cohesion. When a pack member dies, wolves exhibit search behavior, vocalization (howling), and temporary disruption of social routines. These responses likely serve an adaptive function: they help the group reorganize roles and maintain social bonds in the face of loss.
Domestic dogs inherited this social neurobiology but directed it toward humans and other household animals. Over roughly 30,000 years of co-evolution, dogs developed an attachment system toward humans that parallels the infant-caregiver bond described by psychologist John Bowlby. When that attachment figure disappears — whether through death, rehoming, or prolonged absence — the dog's stress response activates in much the same way a human child's would.
From an evolutionary standpoint, grief isn't a luxury emotion — it's a mechanism that reinforces social bonds. Animals that grieve are animals that formed strong attachments, and those attachments improved survival. A dog that searched for a lost pack member was more likely to reunite with the group. A dog that vocalized distress was more likely to attract help from remaining companions.
This is why you'll often see a surviving dog search the house for a deceased companion, sniff their bedding, or wait at the door at the usual walk time. These aren't random behaviors — they're the modern domestic expression of ancestral search-and-reunite instincts.
The Neurobiology: How a Dog's Brain Processes Loss
Understanding the physiological mechanism behind canine grief requires looking at three interconnected systems: the oxytocin pathway, the hypothalamic-pituitary-adrenal (HPA) axis, and the limbic system.
Oxytocin and Social Bonding
Dogs and humans share a mutual oxytocin feedback loop — when a dog gazes at their owner, both species experience a surge in oxytocin, the "bonding hormone." This was demonstrated in a widely cited 2015 study by Miho Nagasawa and colleagues, published in Science. When a bonded companion (human or canine) dies, that oxytocin source vanishes abruptly. The dog's neurochemistry shifts from a bonded, regulated state to an unregulated one, producing the behavioral signs we interpret as grief.
The HPA Axis and Stress Response
The hypothalamic-pituitary-adrenal axis is the body's central stress response system. When a dog loses a companion, the disruption of routine and social contact triggers the HPA axis to release corticotropin-releasing hormone (CRH), which stimulates the pituitary gland to release adrenocorticotropic hormone (ACTH), which in turn signals the adrenal glands to produce cortisol.
Elevated cortisol over days or weeks produces measurable effects:
- Suppressed appetite (cortisol alters ghrelin and leptin signaling)
- Sleep disruption (cortisol interferes with melatonin cycles)
- Increased vigilance and anxiety (cortisol sensitizes the amygdala)
- Immune suppression (chronic cortisol reduces white blood cell efficacy)
The Limbic System: Emotional Processing
Dogs possess a well-developed limbic system, including the amygdala (emotional processing), hippocampus (memory formation), and anterior cingulate cortex (associated with social pain in humans). MRI studies conducted by Gregory Berns at Emory University have shown that dogs' brains activate in response to familiar scents in ways that suggest emotional attachment processing. When that familiar scent is no longer present, the brain's expectation-reward circuit is disrupted, producing a state analogous to what humans experience as loss.
What Grief Looks Like in Dogs: Signs and Symptoms
Canine grief doesn't have a single presentation. The symptoms vary based on the dog's personality, the strength of the bond with the lost companion, and the nature of the loss. Here's what to watch for:
| Category | Common Signs | Typical Duration |
|---|---|---|
| Behavioral | Searching the house, waiting at doors/windows, increased clinginess, withdrawal from family members | 2 weeks to 6 months |
| Appetite | Reduced interest in food, skipping meals, eating more slowly, refusing treats | 3 days to 3 weeks (most common) |
| Sleep | Sleeping more than usual, restlessness at night, sleeping in the deceased companion's spot | 1 to 8 weeks |
| Vocalization | Whining, howling, whimpering, especially at times associated with the lost companion | 1 to 4 weeks |
| Activity Level | Reduced play, reluctance to go on walks, decreased interest in toys | 2 weeks to 3 months |
| Physiological | Elevated cortisol, weight loss, minor immune suppression leading to mild GI upset | 2 to 6 weeks |
When Grief Signals a Deeper Problem
Most grief-related behaviors resolve within two to three months. However, certain signs warrant a veterinary visit to rule out underlying medical conditions that grief stress may have triggered or worsened:
Consult your veterinarian if your grieving dog shows any of these:
- Complete food refusal lasting more than 48 hours (risk of hepatic lipidosis in small breeds)
- Vomiting or diarrhea persisting beyond 72 hours
- Extreme lethargy — inability to rise, no response to usual motivators
- Self-injury or compulsive behaviors (excessive licking to the point of skin damage)
- Aggression that wasn't present before the loss
- Signs of pain (hunched posture, trembling, reluctance to be touched)
Stress can exacerbate pre-existing conditions like inflammatory bowel disease, allergies, or anxiety disorders. Always consult your veterinarian to distinguish grief from illness.
How Dog Grief Differs From Human Grief
While the neurochemical parallels are real, there are important differences between how dogs and humans process loss:
Myths vs. Facts About Canine Grief
| Myth | Scientific Reality |
|---|---|
| "Dogs don't understand death — they just miss the routine." | Dogs may not conceptualize death abstractly, but research shows they respond to the permanent absence of a bonded companion with physiological stress markers that go beyond simple routine disruption. |
| "If a dog grieves, you should get another dog right away." | Introducing a new animal during acute grief can increase stress. Dogs need time to stabilize. A 2016 study found that 65% of owners who waited 1–3 months before adopting reported smoother transitions than those who adopted immediately. |
| "Dogs grieve exactly like humans do." | Dogs don't engage in prolonged rumination or existential processing. Their grief is more immediate, sensory, and behaviorally expressed. They respond to absence rather than the concept of mortality. |
| "Showing emotion in front of your dog makes it worse." | |
| "Only dogs that lived together grieve each other." | Dogs can grieve regular playmates, dog-walking group companions, and even visiting dogs they bonded with. The strength of the affiliative bond matters more than cohabitation. |
Breed and Individual Variations in Grief Response
Not all dogs grieve with equal intensity, and breed tendencies play a role — though individual personality is the stronger predictor.
Breeds that may show more pronounced grief responses tend to be those with strong social bonding drives:
- Velcro breeds (German Shepherds, Labrador Retrievers, Golden Retrievers, Vizslas, Doberman Pinschers) — bred for close cooperation with humans, these dogs often form intense attachment bonds
- Herding breeds (Border Collies, Australian Shepherds, Shetland Sheepdogs) — their work depends on constant social attunement, making disruption more destabilizing
- Companion breeds (Cavalier King Charles Spaniels, Bichon Frises, Havanese) — selectively bred for human attachment, they may struggle more with loss
Breeds that may show less visible grief include more independent types:
- Primitive/spitz breeds (Shiba Inus, Akitas, Basenjis) — tend toward emotional self-reliance
- Livestock guardian breeds (Great Pyrenees, Anatolian Shepherds) — bred for independent decision-making
- Scent hounds (Bloodhounds, Beagles) — may be more focused on environmental stimuli than social disruption
However, these are tendencies, not rules. A Shiba Inu that was deeply bonded to a canine housemate may grieve more visibly than a Golden Retriever that was only loosely affiliated. The quality of the bond predicts the grief response more reliably than breed.
Practical Takeaways: Supporting a Grieving Dog
What to Do in the First 72 Hours
- Maintain routine rigorously. Feed, walk, and play at the same times. Predictability reduces cortisol spikes. Dogs rely on temporal patterns — if dinner was at 6:00 PM, keep it at 6:00 PM.
- Don't remove all traces immediately. Leave the deceased companion's bedding or a favorite toy accessible for at least one to two weeks. The familiar scent provides olfactory continuity. Some behaviorists recommend letting the surviving dog see or sniff the deceased companion's body, though evidence is anecdotal — observe your dog's reaction and don't force it.
- Increase gentle physical contact. Petting triggers oxytocin release in both species. Aim for 10–15 minutes of calm, sustained contact (not vigorous play) two to three times daily.
- Monitor food intake carefully. If your dog eats less than 50% of their normal amount for two consecutive days, try warming their food to enhance aroma, adding low-sodium bone broth, or offering a bland diet of boiled chicken and white rice (1:2 ratio). If refusal continues past 48 hours, contact your vet.
Weeks 1–4: Rebuilding Stability
- Introduce short, novel activities. A new walking route, a puzzle feeder (like the Kong Classic, ~$15–$18), or a 10-minute training session with high-value treats (freeze-dried liver, ~$12–$20 for a 3 oz bag) can stimulate dopamine and counteract the low-motivation state grief produces.
- Avoid major environmental changes. Don't rearrange furniture, start a new daycare program, or introduce a new pet during this window.
- Use Adaptil (DAP) pheromone diffusers (~$25–$35 for a 30-day refill). Synthetic dog-appeasing pheromones mimic the calming signals nursing mothers produce. Clinical studies show modest but measurable reductions in stress-related behaviors.
- Consider L-theanine supplements (e.g., Solliquin or Anxitane, ~$25–$40). L-theanine, an amino acid found in green tea, promotes alpha-wave brain activity associated with calm alertness. Typical dosage: 100 mg for dogs under 22 lb (10 kg), 200 mg for 22–44 lb (10–20 kg), 300 mg for 44+ lb (20+ kg) — but confirm with your veterinarian before starting any supplement.
Months 1–6: Long-Term Recovery
- Gradually expand social opportunities. Arrange brief, calm playdates with familiar dog friends. Avoid overwhelming dog park visits.
- Assess readiness for a new companion. If you're considering adopting another dog, wait until your surviving dog has returned to baseline behavior — normal appetite, normal sleep, normal play interest — for at least two to four weeks.
- Consult a certified veterinary behaviorist (DACVB) or a certified professional dog trainer (CPDT-KA) if grief behaviors persist beyond six months or escalate. Rates typically range from $150–$300 per session.
Related Behaviors: The Broader Picture of Canine Emotional Life
Grief doesn't exist in isolation. It's part of a constellation of emotionally driven behaviors that science increasingly validates in dogs:
- Separation anxiety: Shares physiological overlap with grief — both involve HPA axis activation when a bonded figure is absent. Dogs with pre-existing separation anxiety may experience more intense grief.
- Social referencing: Dogs look to their owners for emotional cues in uncertain situations (research from the University of Milan, 2016). This same attunement means they detect household emotional shifts after a death.
- Empathic concern: Studies show dogs approach and physically contact humans who are crying, suggesting a proto-empathic response. This capacity for emotional resonance is the same neural infrastructure that enables grief.
- Jealousy and social comparison: Research from UC San Diego (2014) demonstrated that dogs show jealous behaviors when their owner interacts with a realistic stuffed dog. This suggests dogs track social relationships and react to disruptions in them — the same tracking that makes loss painful.
Frequently Asked Questions
Why do dogs grieve when another dog dies?
Dogs are obligate social animals with neurobiological attachment systems. When a bonded companion dies, the sudden absence of social contact, shared routines, and oxytocin-releasing interactions triggers a stress response mediated by the HPA axis. The dog isn't mourning mortality in the abstract — they're responding to the concrete loss of a relationship that regulated their emotional and physiological state.
Can dogs sense when another dog is dying?
There's no definitive proof that dogs understand impending death, but they do detect physiological changes. Dogs can smell volatile organic compounds associated with disease, and they notice behavioral shifts (lethargy, altered breathing, changed scent profiles). Many owners report that surviving dogs became unusually attentive or protective in the days before a companion's death, suggesting they sensed something was wrong even if they didn't conceptualize it as "dying."
How do dogs process the absence of a companion?
Dogs process absence primarily through olfactory and routine-based memory. Their hippocampus encodes spatial and temporal patterns — "my companion is usually here at this time" — and when those expectations are violated repeatedly, the brain's reward prediction system generates an error signal. This produces the searching, waiting, and vocalizing behaviors we observe. Over weeks, the brain updates its predictive models and the behaviors gradually extinguish.
What does it mean when my dog lies in the deceased dog's bed?
This is scent-seeking behavior. Your dog's olfactory system — with approximately 300 million scent receptors (compared to humans' 6 million) — finds comfort in the residual scent of their companion. Lying in that spot provides olfactory stimulation that partially satisfies the attachment system. It's analogous to a person holding a loved one's sweater. This behavior typically diminishes as the scent fades over one to three weeks.
Is it normal for a dog to stop eating after losing a companion?
Yes — reduced appetite is one of the most commonly reported grief responses, documented in approximately 32% of grieving dogs according to the 2016 Uccheddu study. Appetite loss typically lasts 3 to 14 days. However, if your dog refuses all food for more than 48 hours, or if they're a small breed (under 15 lb / 7 kg) at risk of hypoglycemia, contact your veterinarian promptly.
How is canine grief different from human grief?
Humans grieve with cognitive awareness of death's permanence, often engaging in prolonged rumination, existential processing, and cultural mourning rituals. Dogs grieve more immediately and behaviorally — they respond to the absence rather than the concept. They don't appear to ruminate on mortality, and their recovery tends to follow a more predictable timeline (2 weeks to 6 months) without the complicated grief trajectories humans can experience. However, the underlying neurochemistry — cortisol elevation, oxytocin disruption, amygdala activation — shows meaningful parallels.
Should I let my dog see the body of the deceased pet?
This is a personal decision with limited scientific data. Some veterinary behaviorists suggest that allowing the surviving dog to sniff the deceased companion may help them process the change, since dogs gather information primarily through scent. Anecdotal reports suggest dogs who are allowed to investigate may search less afterward. However, if your dog shows signs of fear or stress, don't force the interaction. There's no evidence that skipping this step causes harm.
When should I consider medication for a grieving dog?
If behavioral interventions (routine maintenance, enrichment, pheromone therapy, supplements) haven't improved your dog's condition after four to six weeks, or if the grief response is severely impacting their health (significant weight loss, self-injury, extreme anxiety), consult your veterinarian about anti-anxiety medications. Options may include fluoxetine (Prozac, ~$10–$30/month), trazodone (~$15–$40/month), or gabapentin (~$10–$25/month). These require veterinary prescription and monitoring. Never administer human medication dosages without explicit veterinary guidance.
References and Further Reading
- Uccheddu, S. et al. (2022). "Domestic Dogs (Canis familiaris) Grieve the Loss of a Conspecific." Animals, 12(4). MDPI
- Nagasawa, M. et al. (2015). "Oxytocin-gaze positive loop and the coevolution of human-dog bonds." Science, 348(6232). Science.org
- Berns, G. (2013). "Functional MRI in awake unrestrained dogs." PLOS ONE. PLOS ONE
- American Kennel Club: How to Help a Grieving Dog
- ASPCA: Common Dog Behavior Issues
Robin Maitland
All our authors care for dogs every day — read more of their work on the authors page.
