Foods That Harm Dogs: The Ones That Matter and the Ones That Don’t

Half the lists circulating online are frightening and inaccurate. The other half are so long that nobody reads to the end, which means the genuinely dangerous items get the same weight as the ones that cause mild wind.

Worth separating them properly, because the response to a dog eating chocolate is not the same as the response to a dog eating a slice of onion, and knowing which is which saves both unnecessary panic and dangerous complacency.

One line worth drawing before the lists start, because it governs everything that follows.

There are foods that give a dog a bad couple of days, and foods that can kill him, and the correct response to each is completely different. The first group — the bin raid, the fatty scraps, the thing off the beach — leaves you with a disrupted gut and a dog who feels sorry for himself. That’s where ordinary care belongs: small frequent meals, plenty of water, fibre, and daily Probiotic Dog Treats so the population is in reasonable condition when it happens, which for most dogs it periodically will.

The second group needs a phone call and a car, and nothing from a cupboard has any part in it. Getting that distinction right is most of what this article is for.

Ring immediately for these

Xylitol, also labelled birch sugar or E967. The most dangerous item on any list and the least well known. Causes a catastrophic insulin release and, at higher doses, liver failure. Very small amounts matter. Found in sugar-free gum, mints, some peanut butters, protein bars, sugar-free baking, vitamin gummies, some toothpastes and some medicines. Always check peanut butter labels before using it in a Kong.

Grapes, raisins, sultanas and currants. Cause kidney failure and the mechanism still isn’t understood. What makes them dangerous is the unpredictability — there’s no reliable safe dose, and some dogs are severely affected by a handful while others are fine. Mince pies, Christmas cake, stollen, hot cross buns, cereal bars, trail mix.

Chocolate. Theobromine and caffeine. Dark and cooking chocolate are far more dangerous than milk; white barely counts. Causes vomiting, hyperactivity, tremors, racing heart, seizures. Weigh the risk by cocoa content and dog size.

Antifreeze, or anything containing ethylene glycol. Sweet-tasting, and a small volume causes kidney failure. Garages, driveways, screenwash. Absolutely time-critical — treatment works early and not late.

Mouldy food, compost and rotting matter. Tremorgenic mycotoxins cause tremors and seizures within a couple of hours. Mouldy bread and cheese, compost heaps, fallen fruit. Badly under-recognised.

Blue-green algae, on lakes and ponds in warm weather. Rapidly fatal, no antidote. If water looks like pea soup or has scum on the surface, keep him out and don’t let him drink.

Macadamia nuts. Weakness, tremors, inability to stand. Rarely fatal, always alarming.

Alcohol, including uncooked bread dough, which ferments in the stomach and produces both alcohol and expanding gas.

For any of these: ring your vet or an animal poison line straight away, take the packaging, and note the time and rough quantity. Don’t try to make him sick at home — salt water is dangerous and home methods often cause more harm than the original item.

Worth a call, usually manageable

Onions, garlic, leeks, chives and shallots. Damage red blood cells. The dose matters and cumulative exposure counts, so regular small amounts in gravy, stuffing or table scraps add up. Cooked, raw and powdered all count, and powdered is the most concentrated.

Cooked bones. Splinter. A frequent cause of emergency surgery.

Corn cobs. The classic obstruction — they don’t break down and usually need removing surgically.

Very fatty food. Sausages, roast trimmings, cheese, cream, butter. The commonest trigger for pancreatitis, which is painful, expensive and sometimes fatal.

Large volumes of salt, including play dough and rock salt from paths.

Avocado. The flesh is largely fine for dogs. The stone is a genuine obstruction risk and the main reason it’s on lists.

Caffeine. Coffee grounds, tea bags, energy drinks.

Raw dough, as above.

The ones people worry about unnecessarily

Worth knowing so you don’t spend an evening panicking.

A small amount of milk or cheese. Most adult dogs digest lactose poorly, so it may cause wind or loose stools. Not toxic.

Bread, plain and baked. Fine in small amounts.

Cooked plain chicken, turkey, beef, white fish. Not only safe but the basis of most bland diets.

Carrot, green beans, cucumber, courgette, peas, pumpkin, sweet potato. All fine, all useful for bulking out a diet.

Apple, banana, blueberries, strawberries, melon. Fine. Remove apple pips, which contain cyanide compounds.

Plain cooked rice and pasta. Fine.

Peanut butter, provided it contains no xylitol.

Plain popcorn, unsalted and unbuttered.

Eggs, cooked.

Tomato, ripe and red. Green parts and leaves are the problem, not the fruit.

A single sultana. Worth a call for reassurance and not usually a crisis. It’s repeated or larger quantities that cause the real harm.

Christmas, specifically

Vets see a reliable spike and it isn’t a coincidence.

The problem is that everything dangerous appears at once and within reach. Chocolate in stockings and on trees. Mince pies, Christmas cake and pudding, all loaded with raisins. A bin full of turkey carcass, goose fat and stuffing containing onion. Cheese boards. Alcohol in glasses at dog height. Visitors who think a bit of turkey won’t hurt.

Practical measures: bins with latching lids or behind a closed door, chocolate decorations off the lower branches, and one clear instruction to every guest that nobody feeds the dog anything at all. Say it as they arrive rather than after.

And be specific with children, who mean well. Give them a pot of his own kibble so they have a legitimate way to feed him.

What to do if he’s eaten something

Work out what, how much and when. All three matter for treatment decisions.

Ring the vet or a poison line immediately for anything on the first list. Out of hours if necessary. This is exactly what they’re for.

Take the packaging with you, or photograph the ingredients list. Xylitol content in particular is often the deciding factor.

Don’t induce vomiting at home. Vets can do it safely and quickly with an injection; home methods are unreliable and sometimes damaging. And for some substances vomiting is actively contraindicated.

Don’t wait for symptoms. With most of the serious ones, treatment before signs appear works far better than treatment afterwards. By the time a dog eating antifreeze looks unwell, the window has largely closed.

Don’t feel embarrassed. Practices deal with this constantly and would far rather hear from you early.

Human medicines, which cause more poisonings than food

Worth its own section, because in terms of actual cases seen this outranks most of the food list.

Paracetamol. Dangerous to dogs and lethal to cats. Never give it, and keep it out of reach — handbags and bedside drawers are where dogs find it.

Ibuprofen and other human anti-inflammatories. Cause stomach ulceration and kidney damage. Genuinely common, usually given by well-meaning owners trying to help a limping dog. Don’t. Veterinary anti-inflammatories exist and are dosed for dogs.

Antidepressants and ADHD medication. Serious and increasingly common as more households have them.

Sleeping tablets and sedatives.

Vitamin D supplements, which are more dangerous than most people realise.

Iron tablets, including pregnancy supplements.

The pattern with almost all of these is the same: a blister pack left on a worktop or in a bag, and a dog who chews through it. Keep medication in a closed cupboard rather than anywhere accessible, tell visitors to keep bags off the floor, and never give a human medicine to a dog on the assumption that a smaller dose makes it safe.

Plants and garden hazards

Less discussed than food and just as available.

Bulbs — daffodil, tulip, hyacinth. Bulbs are worse than flowers, and autumn planting season is when dogs dig them up.

Yew, laburnum, foxglove, oleander, azalea and rhododendron. All genuinely toxic.

Acorns and conkers, in autumn. Toxic in quantity and a real obstruction risk.

Mushrooms and toadstools. Some are seriously poisonous and identification is not something to attempt in a hurry.

Slug pellets and rodenticides, both of which are designed to be eaten and often flavoured to be attractive.

Cocoa mulch, which contains theobromine like chocolate.

Compost heaps, for the mould risk covered above.

If your dog digs or grazes, it’s worth walking the garden once with this list in mind. Fencing off one bed is easier than supervising every trip outside.

Prevention, which is mostly logistics

Training helps and management works today.

Bins with proper lids, or behind a door. Compost heaps fenced. Food off worktops rather than pushed to the back. Visitors’ handbags out of reach, because paracetamol and sugar-free gum both live in handbags. Medication in a closed cupboard rather than a bedside drawer.

Teach a proper “leave it” and a trade-based “drop it”, and never chase a dog who has something — chasing is the most reliable way to make him swallow it fast.

Keep the poison line number and your out-of-hours vet number in your phone now, before you need them at eleven at night.

After a bin raid, specifically

Assuming nothing on the urgent list was in there, the next few days are about a gut that’s had a load of bacteria, fat and unfamiliar protein dumped into it.

Small, frequent, plain meals rather than his usual two. Water always available. A little fibre — plain tinned pumpkin or psyllium — to firm things up. Keep the gut support going.

Expect two or three days of loose stools and some wind. What isn’t expected is blood, repeated vomiting, lethargy, or a painful abdomen, and any of those changes it from a recovery to an appointment.

And do work out how he got in, because a dog who has raided a bin once has learned that bins contain food.

Keep a list on the fridge

The single most useful thing, because nobody thinks clearly at ten at night with a chewed packet in their hand.

Your practice number. The out-of-hours number, which is often different. An animal poison line number. And a short list of the genuinely urgent items — xylitol, raisins, chocolate, antifreeze, mouldy food, blue-green algae — so whoever’s home knows the difference between ring now and ring in the morning.

Tell the rest of the household where it is. Most of these incidents happen when the person who knows what to do isn’t the person who’s in.