The hazard is not the table itself but the 2 hours after it, when plates move to the floor, guests hand out bites, and a cat works along the counter edge unnoticed. Most cases that reach an emergency clinic in late December involve 4 foods, and 3 of them look harmless to anyone who is not a cat.
Allium: damage starts at 5 g per kg
Onion, garlic, shallot, leek and chives all belong to the allium family and all of them destroy feline red blood cells. Organosulfur compounds oxidize hemoglobin into Heinz bodies, which the spleen then removes, so hemolytic anemia develops over days rather than minutes.
About 5 g of onion per kg of body weight is where cats begin to show damage, which makes 20 g of cooked onion a real dose for a 4 kg cat — roughly 2 tablespoons of caramelized onion. Garlic is more concentrated per gram, and powders are worse: a level teaspoon of onion powder weighs about 2.5 g and carries the punch of 10 g of fresh onion, so 2 teaspoons stirred into a sauce is enough to matter. Cooking does not destroy the compounds, and drying concentrates them.
Signs appear 1 to 5 days later: vomiting, drooling, pale or yellow gums, weakness, fast breathing, and dark urine from hemoglobin. A cat that licked onion gravy often looks normal at the table and unwell on day 3. There is no home treatment, so a known ingestion is a phone call, not a wait-and-see.
Grapes, raisins and currants: no safe dose exists
Grapes and their dried forms cause acute kidney injury in cats, and nobody has established a toxic dose. The suspected agent is tartaric acid, and individual susceptibility varies enormously: one cat eats a grape and is fine, another develops kidney failure from a small amount. Raisins are worse by weight because the water is gone, and they hide in mince pies, fruitcake, panettone, trail mix and stuffing.
Since no dose can be calculated, the rule is simpler than for allium: if ingestion is confirmed, go to the clinic the same day, with bloodwork at 24 and 48 hours. Vomiting, dullness and low urine output are late signs; by the time they appear the kidney injury is already running.
What each food does, and how fast
| Food | Dose (4 kg cat) | Onset (h) | First signs |
|---|---|---|---|
| Onion, raw or cooked | 20 g (5 g/kg) | 24 to 120 h | Pale gums, weakness, dark urine |
| Onion or garlic powder | 2 tsp (about 5 g) | 24 to 120 h | Same, faster onset |
| Garlic, fresh | 5 g | 24 to 72 h | Pale gums, drooling |
| Grapes, raisins, currants | 1 grape or more, no safe dose | 12 to 72 h | Vomiting, low urine output |
| Alcohol (wine, liqueur) | 8 ml wine (1.5 to 2 ml/kg ethanol) | 0.5 to 1.5 h | Wobbling, vomiting, collapse |
| Bread dough | 20 g, about a thumbnail | 1 to 3 h | Bloated abdomen, retching |
| Cooked bones | 1 bone | 0.5 to 6 h | Drooling, pawing at the mouth |
| Fat trimmings, gravy | 15 ml, 3 tsp | 12 to 24 h | Vomiting, abdominal pain |
| String, twine, roast netting | 5 cm or more | 24 to 72 h | Vomiting, hunched posture |
Fat, bones and string
Fat is the most common trigger of a post-holiday pancreatitis flare. Butter, turkey skin, pan drippings and gravy can produce vomiting and abdominal pain within 12 to 24 hours in a cat with a sensitive pancreas. Keep the fat out of reach and drop the tradition of a plate for the cat.
Cooked poultry bones splinter into slivers that perforate the mouth, esophagus or bowel. Never give a cooked bone, and never let a cat work on a carcass in the bin. String, twine and the netting around a roast are worse than bones in one respect: one end anchors at the tongue or pylorus and the intestine saws against it with every contraction, which is a linear foreign body and usually means surgery.
Alcohol and dessert
Cats are small and have limited hepatic capacity, so alcohol acts fast. About 1.5 to 2 ml of pure ethanol per kg produces wobbling, disorientation and vomiting, which for a 4 kg cat is roughly 8 ml of wine — 2 laps from a spilled glass. Cream liqueurs, rum cake, soaked fruit and the dregs of a cocktail all count.
The 2 to 6 hour observation window
Most acute food poisonings declare themselves within 2 to 6 hours: vomiting, drooling, tremors, weakness, a distended abdomen. That window is why the cat should stay indoors and be checked every hour or so all evening. Allium is the exception at 1 to 5 days, and grape kidney injury can take 24 to 72 hours to appear in bloodwork.
Three rules for guests
- No food from the table at all, including a single piece of turkey. If someone wants to give the cat something, hand them a treat from the cat's own jar and keep that jar by the door.
- Plates and glasses go to the kitchen the moment they are empty, never to the floor or the coffee table. A wine glass at tail height is a cat-sized dose of ethanol.
- The kitchen door stays shut while the oven is open, and the bin is emptied before guests arrive. Turkey carcasses go out the same night, not to the bin under the sink.
If the cat already ate something
Do not induce vomiting. Cats are easy to injure with hydrogen peroxide, sharp bones do more damage coming back up, and some toxins cause more harm on the second pass through the esophagus. Instead collect 4 facts: what food, how much, when, and the cat's weight. Then call the clinic and read them out. Bring the packaging, because concentration decides the treatment.
The first-hour sequence, including what not to do while you are on the phone, is in poisoning first aid. The full list of dangerous items is under foods toxic to cats, and a single-item lookup is in the toxicity checker.
Before the guests arrive
- Empty the bin, put the lid on, and move it behind a closed door.
- Write the clinic number and an emergency number on the fridge at eye level.
- Set out a jar of cat treats and say the rule out loud at the door.
- Feed the cat its normal meal before the guests come, so it is not hungry and begging.
- Check the floor and the bin for bones, string and foil before going to bed.
General information, not a diagnosis.
Frequently asked
How much onion is dangerous for a cat?
Damage to red blood cells starts at roughly 5 g of onion per kg of body weight, so about 20 g is a real dose for a 4 kg cat. Powdered onion is far more concentrated, with a teaspoon carrying the equivalent of 10 g fresh, and signs such as pale gums and weakness appear 1 to 5 days later.
Can a cat have a small piece of turkey at dinner?
Plain cooked turkey meat is not toxic, but the skin, fat, gravy and bones around it are the problem, and a cat that learns to beg repeats the behaviour at every meal afterwards. If a guest wants to give something, use a treat from the cat's own jar and keep plates off the floor.
Should I make my cat vomit after it ate something toxic?
No. Hydrogen peroxide injures the stomach, sharp bones do more damage on the way back up, and some toxins are worse on a second pass through the esophagus. Call the clinic with the food, the amount, the time and the cat's weight, and follow their instruction instead.