Foods That Are Toxic to Dogs: The List Every Owner Should Know

The quick list

Food	Why it’s dangerous	How serious
Xylitol (sugar-free gum, some peanut butters)	Crashes blood sugar; can cause liver failure	Emergency, even in small amounts
Grapes, raisins, currants	Can cause sudden kidney failure	Emergency; no known safe amount
Chocolate, cocoa, coffee, caffeine	Stimulants that overwork the heart and nervous system	Depends on type and amount; dark and baking chocolate are worst
Onions, garlic, leeks, chives	Damage red blood cells and cause anemia	Can build up over days, including from powders
Macadamia nuts	Weakness, tremors, high temperature	Usually not fatal, but needs a vet call
Raw bread dough	Expands in the stomach and produces alcohol	Emergency
Alcohol	Poisoning, low blood sugar, breathing problems	Emergency
Cooked bones, fatty scraps	Splinters, blockages, pancreatitis	Can need surgery

Xylitol

Xylitol (sometimes listed as “birch sugar”) is a sugar substitute in sugar-free gum, mints, some peanut and nut butters, baked goods, toothpaste, and chewable vitamins. In dogs, it triggers a rapid release of insulin that can drop blood sugar dangerously low, often within an hour. Larger amounts can cause liver failure.

Watch for: vomiting, weakness, wobbling, collapse, and seizures.

Tip: check the label on any peanut butter you use for treats or to hide pills.

Grapes, raisins, and currants

Grapes and their dried forms can cause sudden kidney failure in dogs. Not every dog reacts, and there’s no amount known to be safe, so treat any amount as an emergency. Veterinary researchers believe tartaric acid is the likely cause, which would also explain why tamarind is a risk.

Remember the hidden sources too: trail mix, raisin bread, cookies, and granola.

Watch for: vomiting (often within a few hours), lethargy, loss of appetite, and peeing less than usual.

Chocolate and caffeine

Chocolate contains theobromine and caffeine, stimulants that dogs process far more slowly than people do. The darker and more bitter the chocolate, the more dangerous it is: unsweetened baking chocolate and cocoa powder are the worst, and milk chocolate is less concentrated. White chocolate has very little, but it’s still fatty and can upset the stomach.

Coffee grounds, tea bags, energy drinks, and caffeine pills carry the same risk.

Watch for: vomiting, diarrhea, restlessness, panting, a racing heart, tremors, and seizures.

When you call, have the type of chocolate, roughly how much is missing, and your dog’s weight ready. The vet uses those to work out how serious it is.

Onions, garlic, leeks, and chives

Everything in the onion family (raw, cooked, dried, or powdered) contains compounds that damage a dog’s red blood cells and can cause anemia. Garlic is more concentrated than onion. Problems can come from one large meal or from small amounts eaten repeatedly, like table scraps, gravy, or baby food made with onion powder.

Watch for: weakness, pale gums, fast breathing, and dark or reddish urine. Signs are often delayed by several days.

Macadamia nuts

Macadamia nuts can make dogs weak (especially in the back legs), wobbly, feverish, and shaky, usually within 12 hours. Most dogs recover within a day or two with care, but call your vet. Chocolate-covered macadamias are a double risk.

Raw bread dough and alcohol

Raw yeast dough keeps rising in a warm stomach, which can cause painful bloating. The yeast also produces alcohol as it ferments, so dogs can end up with alcohol poisoning on top of it. Alcohol itself, even a small amount from drinks left within reach, can cause vomiting, low blood sugar, breathing problems, and collapse.

Bones and fatty scraps

Cooked bones are brittle and can splinter, causing choking, tears, or intestinal blockages. Fat trimmings, bacon, and greasy leftovers are a common trigger for pancreatitis, a painful inflammation that often needs hospital care.

Other things to keep away

• Avocado: less toxic to dogs than to birds and livestock, but the pit can cause a blockage.
• Large amounts of salt: homemade play dough and salt-dough ornaments are a real risk.
• Unripe tomatoes and tomato plants: the green parts can upset the stomach; ripe tomato flesh is generally fine.
• Hops: for home brewers, used hops can cause a dangerously high body temperature.

What to do if your dog eats something toxic

1. Get your dog away from it and keep any packaging. It tells the vet exactly what was eaten.
2. Estimate how much was eaten and when.
3. Call your vet or a poison hotline right away. Don’t wait for symptoms.
4. Don’t make your dog vomit unless you’re told to. For some substances, vomiting causes more harm, and home remedies like salt or excess hydrogen peroxide can be dangerous.
5. Follow their instructions, which may mean going straight to an emergency clinic.

Safer treats to share instead

Most dogs can enjoy these in small amounts, as long as they’re plain and unseasoned:

• Carrots, green beans, and cucumber
• Blueberries, and apple slices without the core or seeds
• Plain cooked chicken or turkey with no skin, bones, or seasoning
• Plain canned pumpkin (not pie filling)

Treats, including people food, should make up no more than about 10% of your dog’s daily calories. If your dog has a health condition or is on a special diet, ask your vet first.