When You Lose a Pet: The Real Health Effects of Grief Nobody Talks About Research-backed look at what pet loss does to your body and mind — and why your grief is completely valid
Losing a pet is one of the most underacknowledged forms of grief in modern life. Research shows it can trigger real physical and mental health consequences. This article covers what the science says — and how to find your way through it.
STANDARD
Anyone who has lost a pet knows the experience. The house goes quiet in a specific way. You reach for them out of habit and remember. The routine you built around them — the morning walks, the feeding times, the weight of them settling beside you on the couch — continues to assert itself in their absence. The grief is real, immediate, and in many cases surprisingly severe.
And then someone says “it was just a dog” and you have to decide whether to explain or simply walk away.
The research is unambiguous: pet loss is a genuine and significant form of grief with documented effects on both mental and physical health. A scoping review of 78 studies from 17 countries found consistent validation of the grief experience following pet loss across cultures, demographics, and pet types. (ResearchGate, Cordaro 2012)
The cultural framework that dismisses pet grief is not supported by the science. This article is for the people who already knew that.
* * *
Why Pet Loss Hits So Hard
The bond between humans and companion animals activates the same neurological and psychological attachment systems as human-to-human bonds. The same oxytocin pathways. The same emotional dependency. The same sense of safety and routine that a significant relationship provides. (MIJRD, 2024)
For many people — particularly those who live alone, those with chronic illness or disability, older adults, and those with mental health conditions — a pet is not simply a companion but a primary attachment figure. The structure of the day, the experience of being needed, the physical contact, the unconditional quality of the relationship — these are things the pet provides that may not be available from human relationships in the same consistent and uncomplicated way.
Research is particularly clear on this point for people with mental health conditions. Pets provide emotional support especially in critical times and demonstrate a genuine capability to help manage mental health symptoms. (Brooks et al., 2019, via MIJRD)
When that relationship ends — especially suddenly through accident, illness, or the necessary decision to euthanize — the disruption to the person’s daily structure, emotional regulation, and sense of security can be profound. Research identifies this as a risk factor for mood disorders, anxiety disorders, and grief-related psychopathology, particularly in people with pre-existing vulnerabilities. (Medium, Katy, 2026)
* * *
Disenfranchised Grief: The Problem of Not Being Allowed to Grieve
The specific challenge of pet loss is not only the loss itself but the social context in which the loss occurs. Doka (2002) describes disenfranchised grief as grief that exists in the absence of social recognition — grief that happens but is not acknowledged by the cultural framework around the person, leaving them without the rituals, the time off work, the social permission to mourn openly, or the empathy of others that human loss typically generates. (ResearchGate, Cordaro/Doka)
Pet loss is a primary example of disenfranchised grief. A scoping review found that pet grief can become socially unspeakable — not just minimized but rendered invisible through the absence of shared scripts, empathy, or ritual. (ResearchGate, 2012)
A 2023 Canadian study of 98 older adults who had lost companion animals found that one-third felt they needed to be careful about who they disclosed their grief to, uncertain they would be supported. This group — those who felt they could not grieve openly — showed significantly greater likelihood of perceived decrease in physical health and higher scores on the Pet Bereavement Questionnaire. (Brown et al., 2023, Human-Animal Interactions)
The research is telling us something important here. It is not just the loss that causes harm. It is the loss combined with the social prohibition on grieving it. The hidden grief is the more damaging grief.
* * *
The Physical Health Effects
Pet loss does not only affect mental health. The research documents real physical health consequences that parallel what is seen in other significant bereavements. The 2023 Canadian study found that 38.1% of participants reported a decrease in physical activity following their pet’s death and 47% reported that their emotional health had declined. (Brown et al., 2023)
Prolonged Grief Disorder — which the ICD-11 formally recognized as a diagnosable condition — has been associated in systematic review with insomnia severity, elevated blood pressure, bodily distress syndrome, chronic physical diseases, and poor caregiver health profiles. (PMC, ICD-11 PGD Systematic Review, 2023)
The physical dimension of grief makes physiological sense. Grief activates the stress response system. Sustained stress elevates cortisol, suppresses immune function, disrupts sleep, increases cardiovascular strain, and reduces the motivation to eat, exercise, and maintain the health routines that keep the body functioning. A loss significant enough to produce genuine grief is significant enough to produce genuine physical consequences.
Loss of companion animals can result in complicated grief, depression, anxiety, and insomnia. (Journal of Korean Medical Science, 2023)
* * *
Pet Loss and Children
For children, pet loss can be their first experience of death — and research suggests it may be more impactful than adults typically recognize. A PMC study found that children’s grief responses to a pet’s death can surpass adults’ responses in intensity and duration. The study found that experiences of pet death were associated with elevated psychopathology symptoms in children, even after accounting for other adverse factors such as low socioeconomic status and maternal depression. (PMC, 2021)
This is not an argument against children having pets. The bonds children form with animals have genuine developmental value. It is an argument for taking seriously what a child is going through when that bond ends, providing them with honest acknowledgment of the loss, and not minimizing their grief because the lost family member had four legs.
A child who is told their grief is disproportionate or silly is being given a lesson about which of their emotions are acceptable. That lesson tends to persist.
* * *
Prolonged Grief: When It Doesn’t Lift
Most people who lose a pet move through the acute phase of grief over weeks to months, with the grief gradually integrating into their ongoing life rather than dominating it. But for some people, particularly those with pre-existing vulnerabilities — histories of depression, anxious attachment styles, social isolation, prior trauma, chronic illness — pet loss can trigger Prolonged Grief Disorder. (Medium, Katy, 2026)
PGD is characterized by intense and persistent yearning for the lost relationship, difficulty accepting the loss, bitterness or anger related to the death, and significant functional impairment that persists beyond what the person’s cultural and social context would consider a typical mourning period. Since its formal inclusion in the ICD-11, there is growing recognition that PGD in pet loss deserves the same clinical attention as PGD in human loss. (PMC, ICD-11 PGD Review, 2023)
The therapeutic approaches that show promise for pet-related PGD include Acceptance and Commitment Therapy, which helps individuals acknowledge and accept painful emotions without suppression while redirecting focus toward personal values and meaningful living, and logotherapy, which encourages individuals to find purpose and meaning in the experience of loss.
* * *
The Decision to Euthanize
Pet loss carries a dimension that human loss rarely does: in most cases, the person who loved the animal is also the person who makes the decision about when and how the animal dies. The decision to euthanize a suffering pet is an act of love and an act of extraordinary difficulty, and the grief that follows it frequently carries an additional weight of guilt — a questioning of the timing, the decision, whether enough was done, whether something different should have been tried.
The research and clinical literature on pet bereavement consistently addresses this. The guilt associated with euthanasia decisions is documented, common, and not evidence that the decision was wrong. Veterinarians and grief counselors who work with bereaved pet owners report that this guilt is one of the most consistent features of pet loss grief, and one of the most important to address directly rather than minimize.
The person who made that decision did it out of love. The animal’s suffering ended because someone who loved them made the hardest possible choice on their behalf. That is not a reason for guilt. It is a reason for recognition.
* * *
Finding Your Way Through
Allow the grief to be real
The most damaging thing a person can do in the immediate aftermath of pet loss is accept the cultural message that the grief is not proportionate to the loss. It is. The bond was real. The loss is real. The grief is real. Accepting this — naming it accurately rather than managing it down to something more socially acceptable — is the first step.
Find people who understand
Online communities for pet bereavement are extensive and active. Pet loss support groups exist in most major cities. The Association for Pet Loss and Bereavement maintains a directory of counselors specifically trained in pet bereavement. Grief that is shared with people who recognize it is less damaging than grief carried alone. (APLB.org)
Maintain structure
The loss of a pet frequently means the loss of the routines that structured the day around the animal’s needs. Without those routines, days can become formless in a way that worsens depression and isolation. Deliberately building new structure — even simple, small routines — helps maintain the physical and psychological stability that grief erodes.
Be honest about the physical dimension
Sleep disruption, appetite changes, and reduced motivation to exercise are normal grief responses. They are also physical problems that compound the emotional difficulty if left unaddressed. Basic physical self-care — sleep, food, movement — is not a betrayal of the grief. It is the foundation that makes it possible to get through it.
Seek professional support if needed
If grief is significantly impairing daily functioning beyond a few weeks, or if it is activating existing mental health conditions, professional support is appropriate and available. Grief counseling, therapy, and in some cases psychiatric support can make the difference between grief that integrates and grief that becomes chronic. Pet loss is a legitimate reason to seek this support. A good therapist will not tell you otherwise.
* * *
The Takeaway
The people who dismiss pet loss grief are wrong. Not unkind, necessarily — often they simply have not experienced the kind of bond that makes pet loss devastating, or they have not had the language to understand why it hits as hard as it does. But they are wrong.
The science is clear. The bond is real. The grief is real. The health effects are real. The disenfranchisement that hides the grief and prevents people from seeking support makes all of it worse.
If you have lost a pet and you are struggling, you are not overreacting. You are experiencing the loss of a relationship that mattered. That is exactly what grief is for. Give it the space it needs.
* * *
Sources
Association for Pet Loss and Bereavement. (2026). Find a Counselor. APLB.org.
Brooks, H., et al. (2019). The Power of Support From Companion Animals for People Living With Mental Health Problems. BMC Psychiatry.
Brown, C.A., Wilson, D.M., Carr, E., et al. (2023). Older Adults and Companion Animal Death: A Survey of Bereavement and Disenfranchised Grief. Human-Animal Interactions. DOI: 10.1079/hai.2023.0017.
Cordaro, M. (2012). Pet Loss and Disenfranchised Grief: Implications for Mental Health Counseling Practice. Journal of Mental Health Counseling. ResearchGate.
Doka, K.J. (2002). Disenfranchised Grief: New Directions, Challenges, and Strategies for Practice. Research Press.
Journal of Korean Medical Science. (2023). Relationship Between Childhood Trauma Experience and Companion Animal Loss. JKMS 38(37): e305.
Katy. (2026, June). The Unrecognized Grief: Pet Loss and Prolonged Grief Disorder. Medium.
MIJRD. (2024). The Role of Pets in Well-being and the Therapeutic Impact of Pet Loss. Multidisciplinary International Journal of Research and Development, 4(5).
PMC. (2021). The Mental Health Effects of Pet Death During Childhood. PMC7943653.
PMC. (2023). ICD-11 Prolonged Grief Disorder, Physical Health, and Somatic Problems: A Systematic Review. PMC11960567.
Shear, M.K. (2011). Complicated Grief Treatment. In R.A. Neimeyer (Ed.), Techniques of Grief Therapy. Routledge.
* * *
Press Post