Dogs do appear to remember other dogs that have died, though what they remember and how they process that loss looks different from human grief. Research shows dogs have a form of episodic memory, can recognize individual dogs by scent and sight, and display measurable behavioral changes when a companion dog dies. Whether they grasp the concept of death itself is a more complex question, but the evidence for lasting memory and emotional response is strong.
How Dog Memory Works
Dogs possess what researchers call “episodic-like memory,” a type of recall that allows them to mentally replay past experiences. A 2020 study published in Scientific Reports tested this by asking dogs to repeat their own actions after unexpected delays ranging from seconds to a full hour. The dogs could do it, and their accuracy faded over time in a pattern consistent with genuine memory rather than simple habit. This means dogs don’t just learn routines or respond to cues. They form mental representations of specific past events.
This capacity extends to social relationships. Dogs build detailed mental profiles of the animals and people they live with, shaped heavily by scent. A dog’s sense of smell is so powerful that trained tracking dogs can detect trails that are a week old and determine which direction someone was walking from just a few footprints. For a dog living with another dog, the companion’s scent is woven into every room, every bed, every shared space. That sensory familiarity doesn’t vanish when the other dog dies.
Behavioral Signs of Grief
A 2022 study published in Scientific Reports surveyed hundreds of dog owners and found consistent patterns of behavioral change in dogs after a companion dog died. The numbers tell the story clearly: 67% of surviving dogs sought more attention from their owners, 57% played less, 46% became less active overall, 35% slept more, 35% showed increased fearfulness, 32% ate less, and 30% vocalized more than usual.
These aren’t random shifts. The study found that the severity of these changes correlated with the quality of the relationship between the two dogs. Dogs who had been close companions, who played together frequently and shared space willingly, showed stronger grief responses than dogs who merely coexisted. This suggests the surviving dog isn’t just reacting to a disruption in routine. The response is tied to the specific individual who is gone.
Do Dogs Understand Death?
This is where things get philosophically tricky. Researchers in comparative thanatology (the study of how different species respond to death) have proposed that understanding death doesn’t require abstract reasoning. At its most basic, it requires grasping two things: that a body has stopped functioning, and that this state is permanent. A 2021 analysis published in Synthese argues that both of these can be understood through direct sensory experience rather than complex thought.
The key distinction is between how animals process sleep and how they process death. A sleeping dog is temporarily not doing the things living dogs do, but the expectation remains that it will wake up and resume normal behavior. A dead dog permanently breaks that expectation. The researchers argue that once an animal can shift from “this individual will eventually do the things it normally does” to “this individual will never do those things again,” it has acquired a minimal concept of death. This doesn’t require language or the ability to think about the future in abstract terms. It requires updating an expectation based on experience.
Whether every dog fully makes that cognitive leap is unclear. Some dogs may search for their missing companion for days or weeks, which could suggest they haven’t fully processed the permanence. Others seem to adjust more quickly, particularly if they had the chance to investigate the body.
Why Letting Dogs See the Body May Help
Some veterinary behaviorists recommend allowing the surviving dog to see and smell the body of the deceased companion. VCA Animal Hospitals notes that while dogs have a limited understanding of death as something final, giving them the opportunity to investigate the deceased may reduce the grief response. One last visit lets the surviving dog gather sensory information that could help it process what happened, rather than simply experiencing an unexplained disappearance.
This matters because dogs rely so heavily on scent to understand their world. When a companion simply vanishes, the surviving dog is left with lingering scent traces throughout the home and no information about why the other dog stopped appearing. Allowing contact with the body provides concrete sensory evidence that something fundamental has changed. It’s not a guarantee of closure, and not every situation makes it practical, but behaviorists generally consider it helpful rather than harmful.
Supporting a Grieving Dog
If your surviving dog is showing signs of grief, the most effective thing you can do is maintain consistency. Dogs find predictability reassuring, so keeping regular schedules for meals, walks, play, and bedtime helps them feel secure during a period of disruption. This isn’t the time to overhaul routines or make major changes to the household.
Beyond routine, active engagement helps. Daily walks, new toys, and food-filled puzzle toys can redirect anxious energy and provide positive stimulation. If your dog is pacing or vocalizing excessively, try guiding them to a comfortable spot and offering small treats to help them settle. Reward-based training sessions also give your dog a sense of purpose and strengthen the bond between you at a time when their social world has shrunk.
Most dogs gradually return to normal behavior over days to weeks. If signs of depression or anxiety persist, or if your dog stops eating for more than a day or two, a veterinary behaviorist can help with both behavioral strategies and, if needed, medical support to ease the transition.