Yes, losing a pet can cause depression. More than half of bereaved pet owners experience significant psychological symptoms shortly after a pet’s death, and for some, those symptoms meet the threshold for clinical depression. A study published in The Journal of Veterinary Medical Science found that 56% of pet owners showed neurotic symptoms, including depressive episodes, in the period immediately following their pet’s death. If you’re grieving a pet and wondering whether what you’re feeling is “normal” or something more serious, the answer is that both are possible.
Why Pet Loss Hits So Hard Biologically
The bond between you and your pet isn’t just emotional in an abstract sense. It’s chemical. Interacting with a pet releases oxytocin, the same hormone involved in bonding between parents and children or between romantic partners. Over years of daily companionship, your brain builds a deep attachment loop reinforced by this chemistry every time your pet greets you, sits beside you, or sleeps nearby.
When that bond is suddenly severed, the brain reacts the same way it would to losing a close family member. The oxytocin-driven reward cycle breaks, and the result is a real neurological disruption, not just sadness. This is why pet loss can feel physically painful: the ache in your chest, the difficulty concentrating, the fatigue. Your brain is processing the absence of a relationship it depended on for emotional regulation, sometimes for a decade or more.
In rare cases, the stress of losing a pet can even trigger physical cardiac events. Researchers have documented cases of takotsubo cardiomyopathy, commonly known as broken heart syndrome, caused specifically by the death of a pet. This is a temporary weakening of the heart muscle driven by a surge of stress hormones. It’s uncommon, but it illustrates how seriously the body can react to this kind of grief.
The Range of Symptoms to Watch For
Pet bereavement can produce a wide spectrum of responses. On the milder end, you might feel numbness, disbelief, crying spells, and difficulty sleeping for a few weeks. These are typical grief responses and tend to ease gradually over time. The American Veterinary Medical Association notes that fully acknowledging the reality of a pet’s death may take weeks or months, and that timeline varies from person to person.
For some people, though, the grief deepens into something more persistent. Signs that pet loss has crossed into depression include losing interest in activities you previously enjoyed, withdrawing from friends and family, persistent feelings of emptiness or guilt, changes in appetite or sleep that last beyond the first few weeks, and difficulty functioning at work or in daily routines. Research has documented responses to pet death ranging from temporary numbness all the way to clinical depression, trauma responses, and post-traumatic stress disorder.
There’s no clean dividing line between “normal grief” and depression. But a useful marker is time and function. If your grief is intensifying rather than gradually softening after several months, or if it’s preventing you from meeting basic responsibilities, that’s worth paying attention to.
Why Society Makes It Worse
One of the most damaging aspects of pet loss is how other people respond to it. Researchers use the term “disenfranchised grief” to describe mourning that isn’t openly acknowledged, publicly supported, or socially validated. Pet loss is one of the most common forms. You’ve probably heard some version of “it was just a dog” or “you can always get another one,” and those comments do real psychological harm.
When grief is disenfranchised, it creates a double burden. You’re mourning the loss itself while also feeling ashamed or isolated for how intensely you’re mourning. This lack of validation directly affects both the severity of symptoms and your willingness to seek help. Research shows that perceptions of disenfranchised grief act as a barrier to seeking support and also a barrier to receiving it. People hesitate to call a therapist about a pet’s death because they worry about being judged, and some support providers may unintentionally minimize the loss.
This social dismissal is one reason pet bereavement so often spirals into depression. The grief itself is painful. Feeling like you’re not allowed to grieve makes it worse.
When Grief Becomes Prolonged
Prolonged Grief Disorder is a formal diagnosis that captures grief lasting beyond six months with symptoms severe enough to impair daily life. The core features include intense longing for the deceased, preoccupation with the death, emotional numbness, difficulty reengaging with life, and a sense that a part of you died too. To qualify, at least one of these core symptoms and one associated symptom must be present alongside clear functional impairment.
Here’s the complication: both the DSM-5-TR and the ICD-11, the two major diagnostic manuals used in mental health, technically require that Prolonged Grief Disorder follow the death of a person, not a pet. The DSM-5-TR specifies “the death, at least 12 months ago, of a person who was close to the bereaved individual.” This means that even when pet owners meet every other diagnostic criterion, they can’t formally receive this diagnosis.
Recent research is challenging this exclusion. A 2024 study titled “No Pets Allowed” presented evidence that Prolonged Grief Disorder can and does occur following the death of a pet, arguing that the diagnostic criteria should be expanded. For now, though, this gap in the diagnostic system means some people suffering from prolonged, debilitating grief after a pet’s death may not get the clinical recognition they need.
What Actually Helps
The honest reality is that research on the most effective treatments for pet bereavement is still limited. There are no large clinical trials comparing different therapy approaches for grieving pet owners specifically. What experts recommend is following the general guidelines for human bereavement support, which means not assuming that everyone needs the same thing and making sure people know their options early.
Several forms of support are available: pet loss support groups (many are free and run by veterinary schools or humane societies), individual counseling with a therapist experienced in grief, pet loss hotlines staffed by trained volunteers, and online forums where people share their experiences. The key factor that consistently emerges in the research is normalization. Simply having someone acknowledge that your grief is real and proportionate to what you lost makes a measurable difference in how people cope.
Memorialization also appears to help. Creating a ritual around your pet’s death, whether that’s a small ceremony, a photo album, planting something in their memory, or keeping a meaningful object, has been shown to reduce the intensity of grief and even stimulate personal growth over time. These aren’t just sentimental gestures. They give the brain a way to process the loss as real and meaningful, which is exactly what disenfranchised grief tries to deny.
Who Is Most Vulnerable
Not everyone who loses a pet will develop depression, but certain factors increase the risk. People who live alone and whose pet was their primary source of daily companionship tend to grieve more intensely. The same is true for people whose pet provided emotional support during a difficult period, like a divorce, illness, or another loss. If your daily routine was structured around your pet’s needs (walks, feeding times, morning rituals), the disruption to that structure can amplify feelings of emptiness.
People with a prior history of depression or anxiety are also more susceptible to pet loss triggering a depressive episode. The loss doesn’t create the vulnerability from scratch, but it can reactivate patterns that were previously managed. And people who had to make the decision to euthanize their pet often carry an additional layer of guilt that complicates their grief, even when the decision was clearly the most compassionate one.
If you’re in the middle of this and wondering whether your grief is “too much,” it probably isn’t. What you’re feeling has a biological basis, affects a majority of pet owners, and deserves the same respect as any other significant loss.