Human foods that are dangerous for dogs and cats

A handful of foods that are harmless to us are poisonous to dogs and cats, and a few are dangerous in amounts small enough to be handed over as a treat. If your pet eats one of them, the safe response is to phone your vet or an animal poison line straight away — with the food and the rough amount to hand — rather than wait to see whether it turns out badly. What follows are the ones most worth knowing, not a complete list.

The serious offenders

A short list does most of the damage. Chocolate carries theobromine, and the darker it is the more dangerous. Grapes and raisins can cause kidney failure in dogs with no reliably safe dose. Xylitol — the sweetener in sugar-free gum, some peanut butters and baked goods — triggers a rapid, life-threatening insulin crash and liver damage in dogs. Onions, garlic and chives damage red blood cells. Add macadamia nuts, alcohol, caffeine and raw yeast dough to the keep-well-away pile.

Three of those hide in places worth naming. Xylitol turns up in sugar-free gum and mints, some peanut butters, protein bars, toothpaste and children's medicines — and it is increasingly labelled as birch sugar, which is the same thing. Raw yeast dough rises in the warm stomach and ferments into alcohol, so a dog that steals proving bread has two problems at once. And onion powder is in a great deal of savoury human food, which is why a stolen takeaway or a bowl of gravy is a more realistic exposure than a raw onion.

Cats have their own risks

Cats are exposed to the same onion, garlic, chocolate and alcohol dangers, and their small size means a small amount goes a long way. They are also obligate carnivores with little interest in sweets, so the classic feline emergencies more often involve toxic plants — true lilies above all — than a stolen biscuit. The rule is the same: unknown or toxic, treat it as urgent.

Cats have a narrower liver than a dog for handling foreign compounds, which is why several human medicines and a few essential oils are far more dangerous to them, and why 'a tiny bit won't hurt' translates badly across species. Milk belongs in a different category — most adult cats are lactose intolerant, so a saucer of it causes diarrhoea rather than poisoning — but the practical advice ends up the same, which is that a cat needs nothing from a human plate.

The everyday things people are unsure about

Some foods are neither poison nor a good idea, and the confusion causes its own problems. Cooked bones splinter and cause blockages and perforations; corn cobs are a classic surgical obstruction; peach and cherry stones and avocado pits are both a choking hazard and an obstruction. Very fatty scraps can set off pancreatitis, which is painful and sometimes serious. Salt in quantity — a swallowed handful of playdough or a lump of rock salt — genuinely poisons.

Others are fine in moderation and get treated as forbidden for no good reason: plain cooked meat without seasoning, a little plain rice, carrot, green beans, plain pumpkin, a slice of apple without the core. The honest framing is that treats of any kind should stay a small share of the day's food, and that a dog's diet does not need topping up from the table.

The signs, and the clock

Poisoning can show as vomiting, diarrhoea, tremors, weakness or collapse, but the signs vary by food and some — xylitol and grapes among them — do their harm fast and quietly before much shows at all. That is exactly why the advice is not to wait for symptoms: by the time they are obvious, the easy window may have passed.

The reason speed changes the outcome is mechanical. For the first hour or two much of what was eaten is still in the stomach, and a vet can empty it safely; after that the job shifts from removal to treating the damage, which is slower, more expensive and less certain. Making a pet vomit at home is not a substitute — salt water and hydrogen peroxide both cause their own injuries, and some substances do more harm coming back up. That call is a professional's.

What to do

Call your vet or a pet poison line immediately, and be ready to say what was eaten, roughly how much, and when. Do not try to make your pet vomit unless a professional tells you to, and keep any packaging to show them. Speed and accurate information are what change the outcome here.

Have four things ready when you ring: what it was, including the packaging or the ingredient list; roughly how much, erring on the side of the larger estimate; how long ago; and your pet's weight, since almost every threshold is a dose per kilogram. If the animal is already unwell, say so first. And find out now which service covers your nights and weekends — the number is much easier to look up before you need it.

How to make a slip less likely

Most exposures come down to access rather than ignorance: a bin without a lid, a handbag on a chair, a bowl of chocolates on a low table, a guest who thinks a bit of cake is a kindness. Bins that latch, food behind doors and one clear house rule for visitors — nothing from the table without asking — prevent most of it. Christmas and Easter are the peak seasons for a reason, and a dog that has learned to counter-surf is the one to plan around. The room-by-room pass covers the rest of the house, and the plant list covers what is on the windowsill.