A cat that loses a companion usually shows it in four ways: it eats less, it calls at night, it grooms one patch bald, and it patrols the rooms the other cat used. Most of that is normal for 2-6 weeks. What is not normal is losing more than 10% of body weight, hiding all day, or the same behaviour still running at week 8.
What the signs actually look like
Cats do not grieve in the human sense, with a concept of death. They react to the loss of a routine, a body, and a smell. The signs that show up most often are concrete: eating 20-30% less at meals that used to be finished, yowling between 2 and 4 am at a door or hallway (night yowling), over-grooming the belly or inner thighs until the skin shows, waiting at the other cat's feeding station at the usual hour, and sleeping in a spot the survivor never used before.
Some cats show nothing for the first 3-4 days and then deflate when the smell fades from the furniture. Others are clingy rather than withdrawn, following you room to room and vocalizing when a door closes. Both patterns can be normal.
Why 2-6 weeks is the window
The first 72 hours are usually the worst for vocalizing and searching. Appetite tends to improve somewhere between day 5 and day 14 as the cat settles into a new routine, and most cats are back to baseline behaviour by week 4-6. Progress is not linear: a cat can be fine for four days and then spend a night calling again, especially around the times the pair used to interact.
Two things slow recovery. One is a house where the routine changed at the same time, with feeding hours moved or the surviving cat shut out of rooms it used to share. The other is a treatable illness that started before the death and is now being read as grief.
Weigh the cat: the one objective number
Grief is a behaviour; weight is data. Weigh on the same scale, at the same time of day, every 3 days, and write it down. A loss of 5% in 2 weeks, or 10% overall, means a vet visit rather than more observation. On a 5 kg cat that is 250 g and 500 g — small enough to miss by eye on a fluffy cat.
Also count food. Put down a measured amount and weigh what is left after 30 minutes for wet food, or after 24 hours for dry. "Picking at it" is not a measurement; 25 g eaten out of 80 g is.
Do not add a new cat yet
Two to four weeks is the usual minimum, and the survivor should be eating normally, playing, and sleeping in its usual places before a new cat arrives. Adding one in the first week is the most common mistake. A resident cat that is still stressed does not greet a newcomer with curiosity; it redirects aggression, guards resources, and the introduction fails in a way that is much harder to fix the second time.
There is a medical reason too. If the cat died of an infectious disease — feline leukemia, FIP, or an untreated upper respiratory infection — bowls, bedding, and carriers need cleaning or replacing before another cat uses them. A new cat should be isolated for its first 2 weeks anyway, for its own health. The mechanics of a slow introduction are covered in introducing a new cat.
Company without a new cat
- Two or three play sessions of 10-15 minutes, timed to dawn and dusk, when the pair was most active
- One food puzzle or scatter feed per day, so eating takes 10 minutes instead of 1
- A window perch or cat tree moved into the room the survivor now avoids
- One unwashed blanket from the dead cat left in place for 1-2 weeks, then washed
- Feeding times held to the same minute for the first 2 weeks, even on your worst days
- An extra litter box in the room the cat has started avoiding
Do not fill the house with new furniture and toys in week 1. Novelty is not comfort to a cat whose map of the house just changed; it is more to process. Add one thing at a time and watch whether the cat uses it.
When it is depression, not grief
| Sign | Ordinary grief | Needs a vet |
|---|---|---|
| Appetite | 20-30% less for 5-14 days, then improving | No eating 48 hours, or weight down 10% |
| Vocalizing | Night calling, fading by week 4 | Still nightly at week 6-8 |
| Grooming | More grooming, coat intact | Bald patches, open skin, no grooming at all |
| Activity | Sleeping more, still greeting you | Hiding over 20 hours a day, not moving to eat |
| Duration | Improving by week 4-6 | No change at week 6, or worse |
The reason to see a vet first is that several diseases look exactly like grief in an older cat. Pain from arthritis or dental disease, hyperthyroidism, chronic kidney disease, and anemia all reduce appetite and activity. A blood panel, a T4, blood pressure, and a mouth exam cost less than three months of watching a cat fade. Behaviour medication exists — fluoxetine is used in some cases — but it is not the first step, and it is not a substitute for treating pain.
Your grief is part of the cat's environment
Cats track routine more than mood. Crying in the kitchen does not disturb them; moving dinner from 6 pm to 9 pm does. In the week after a death, the most useful thing you can do for the cat is keep the schedule boring: same feeding times, same play times, same litter routine, and no furniture moved. If you cannot manage a play session, a 5-minute wand session still counts.
If you are not sleeping and the cat is not sleeping, that is worth mentioning to your own doctor as well. A cat that starts waking you at 4 am is often responding to a household that has become nocturnal.
Adding a cat later, if you do
Wait until the survivor has been stable for 2-4 weeks, then go slowly: swap bedding for 3-5 days so both cats carry each other's scent before they meet, feed on opposite sides of a closed door, then a baby gate, then short supervised sessions. A kitten is not automatically easier; a 6-month-old with unlimited energy can overwhelm a 12-year-old resident. Matching energy level matters more than matching age.
Five steps for the first month: weigh every 3 days and log it; keep feeding and play times fixed; add play rather than a new cat; leave one unwashed blanket for 1-2 weeks; book a vet visit if weight drops 10% or nothing has improved by week 6.
Frequently asked
Do cats actually grieve, or am I projecting?
They react to loss without understanding death. What changes for a cat is the routine, the scent, and the social structure of the house, and the behaviour that follows is real and measurable: reduced intake, night calling, over-grooming, and searching. Calling it grief is a useful shorthand, but the practical approach is the same either way: keep the routine stable, measure weight, and rule out illness.
Should I show my cat the body of the other cat?
Many behaviourists suggest letting the survivor sniff the body for 10-15 minutes before burial or cremation, because cats rely on scent to confirm what has happened. It does not work for every cat and it is not required. If the death was traumatic or the body is contaminated, skip it and expect a longer searching phase instead.
How long should I wait before adopting another cat?
At least 2-4 weeks, and only once the surviving cat is eating normally, playing, and sleeping in its usual spots. Rushing this is the most common reason introductions fail, because a stressed resident cat redirects aggression onto the newcomer. If the cat died of an infectious disease, clean or replace bowls and bedding, and isolate the new cat for 2 weeks.