Hi, I’m Taylor Morgan, the pet care expert behind Paw Print Advice. Every guide I publish is grounded in veterinary sources — and this one covers the kitchen foods every pet owner needs to know about.
Most pet owners know chocolate is a problem. Fewer know that sugar-free gum, a handful of raisins, or leftovers cooked with onion can put a dog or cat in real danger. Here’s a practical guide to the human foods that are toxic to dogs and cats, drawn from the ASPCA Animal Poison Control Center — plus what to do if your pet eats something they shouldn’t.
The most dangerous offenders
Chocolate, coffee, and caffeine
These contain methylxanthines, which in pets can cause vomiting, diarrhea, panting, excessive thirst, hyperactivity, abnormal heart rhythm, tremors, seizures, and in severe cases death. The darker the chocolate, the greater the risk — baking chocolate and high-cacao bars are the worst.
Xylitol (sugar-free sweetener)
Found in sugar-free gum, candy, some peanut butters, baked goods, and toothpaste. In dogs, xylitol triggers a dangerous drop in blood sugar and can cause liver damage. Early signs include vomiting, lethargy, and loss of coordination, which can progress to seizures. Check labels — it also appears as “birch sugar.”
Grapes and raisins
Even small amounts can cause kidney damage in dogs. Researchers now suspect tartaric acid is the culprit, which dogs cannot process. There is no established “safe” amount — treat any ingestion seriously.
Onions, garlic, leeks, and chives
The whole onion family damages red blood cells in both dogs and cats — cats are especially sensitive. Cooked, raw, or powdered all count, and concentrated forms like onion powder are worse. That means seasoned leftovers, gravies, and many soups are off the menu.
Also keep away from pets
- Alcohol — even small amounts affect pets far more than people.
- Macadamia nuts — can cause weakness, tremors, and hyperthermia in dogs.
- Avocado — problematic for many species; skip the guacamole share.
- Citrus, coconut, and coconut oil — can cause stomach upset in quantity.
- Milk and dairy — most adult pets are lactose intolerant; expect digestive upset.
- Raw dough with yeast — expands in the stomach and produces alcohol as it ferments.
A peer-reviewed overview in Frontiers in Veterinary Science covers the mechanisms behind these toxicities in detail if you want the science.
Symptoms that should worry you
Vomiting and diarrhea are the most common early signs, but watch also for drooling, lethargy, loss of coordination, tremors, pale gums, unusual thirst, or collapse. Symptoms can be delayed — grape and raisin kidney effects, for example, may not show for a day or more — so don’t wait for your pet to “look sick” before acting.
What to do if your pet ate something toxic
- Remove the food and any packaging — but keep the packaging for reference.
- Call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435, available 24/7.
- Be ready to report what was eaten, roughly how much, when, and your pet’s weight.
- Do not induce vomiting unless a professional tells you to — with some substances it makes things worse.
Prevention beats treatment
Store risky foods out of counter-surfing range, brief your houseguests (grandparents love sharing snacks), secure the trash, and be extra careful around holidays — chocolate at Easter and Halloween, rich seasoned food at Thanksgiving. Save the ASPCA poison control number in your phone right now: (888) 426-4435. That one contact can save your pet’s life.
This article is general guidance, not veterinary advice. If you suspect poisoning, contact your veterinarian or an emergency clinic immediately.
Paw Print Advice 
Leave a comment