10 Human Foods Your Dog Should Never Eat

Dogs · Dog Safety  |  4–5 min read

“A righteous man cares for the needs of his animal.” — Proverbs 12:10

We keep these foods in our kitchens every day — familiar, healthy, completely normal parts of human life. But for your dog, some of the most common items in your home can cause serious harm, and in some cases can be life-threatening even in small amounts.

This is not a scare list. It’s a reference list — one every dog owner deserves to have, worth saving and sharing with anyone who spends time with your dog.

One important note before we begin: if you ever suspect your dog has ingested something toxic, do not wait for symptoms to appear. Contact your veterinarian immediately. Some toxicities — like grape poisoning and xylitol ingestion — cause delayed organ damage. By the time symptoms are obvious, the situation can already be serious.

1. Grapes and Raisins

Grapes and raisins are among the most dangerous foods your dog can eat — and among the most misunderstood, because not every dog reacts the same way. Some dogs consume a few grapes with no apparent effect. Others suffer acute kidney failure from a small handful. The mechanism of toxicity is still not fully understood, which is exactly what makes this so dangerous: there is no known safe amount.

Both seedless and seeded varieties are toxic. Raisins, currants, sultanas, grape juice, raisin bread and baked goods containing raisins are equally dangerous. If you suspect ingestion, do not wait for symptoms — kidney failure can occur within 24 to 72 hours, often before outward signs appear.

2. Onions

All members of the Allium family — onions, leeks, chives and shallots — are toxic to dogs. They contain organosulfide compounds that damage red blood cells and cause haemolytic anaemia, meaning your dog’s body destroys its own red blood cells faster than it can produce new ones.

All forms are dangerous: raw, cooked, dried and powdered. Onion powder — common in human foods and some pet treats — are more concentrated per gram than fresh forms and therefore more dangerous. The effects are also cumulative, meaning small regular amounts can build up over time and eventually trigger a crisis.

3. Xylitol

Xylitol is a sugar substitute found in sugar-free products, and it acts fast. Even small amounts cause a severe drop in blood sugar — producing collapse and seizures within 30 to 60 minutes in some dogs. At higher doses, xylitol causes acute liver failure, which can develop hours to days after ingestion.

Common sources include sugar-free chewing gum, certain peanut butter brands, sugar-free baked goods, mouthwash, toothpaste and some vitamins. If you share peanut butter with your dog, check the label before every purchase — xylitol content in popular brands is increasing.

4. Macadamia Nuts

Macadamia nuts cause a specific neurological response in dogs: hind leg weakness, vomiting, tremors and elevated body temperature, even from relatively small amounts. The exact toxin is not yet identified, but the clinical picture is well documented. Macadamias are rarely fatal in isolation, but they frequently appear in cookies and trail mixes alongside chocolate — creating a doubly toxic combination.

5. Chocolate

Chocolate contains theobromine — a compound dogs metabolise far more slowly than humans do. As it accumulates, it causes cardiac arrhythmia, elevated heart rate, muscle tremors and seizures. Dark chocolate and baking chocolate are the most dangerous due to higher theobromine concentrations. The dose required for toxicity depends on your dog’s weight, so even moderate amounts of dark chocolate can be a serious dose for a small dog.

6. Avocado

Avocados contain persin, a fungicidal toxin present in the fruit, skin, pit, leaves and bark. In dogs, persin causes vomiting, diarrhoea and at higher doses, damage to the heart muscle. The pit presents an additional hazard as both a choking risk and a potential intestinal blockage. There is no safe part of the avocado plant for dogs.

7. Alcohol

Dogs have virtually no tolerance for alcohol. Even small amounts from drinks, desserts or fermented foods can cause vomiting, disorientation, dangerous drops in blood sugar and body temperature, difficulty breathing and at higher doses, death. This risk is particularly relevant during social occasions when food and drinks are within your dog’s reach.

8. Raw or Rising Dough

Unbaked yeast dough continues to rise inside your dog’s warm stomach, causing painful bloat that can escalate to life-threatening gastric dilatation-volvulus. Simultaneously, fermentation within the dough produces alcohol that is absorbed directly into the bloodstream — creating a compound problem of bloat and alcohol poisoning at the same time.

9. Caffeine

Dogs are significantly more sensitive to caffeine than humans. Small quantities from coffee, tea, energy drinks or supplements can produce restlessness, rapid breathing, heart palpitations, muscle tremors and seizures. Coffee grounds and used tea bags are a frequently underestimated source — particularly for curious, food-motivated dogs.

10. Cooked Bones

Cooked bones are brittle and prone to splintering into sharp shards that can lacerate the mouth, throat, oesophagus and intestines — or cause life-threatening blockages. This applies to all cooked bones regardless of size: chicken, pork, beef and lamb alike. Bones from your dinner plate are not safe for dogs, no matter how much they want them.

Keeping Your Dog Safe and Well-Nourished

Knowing what to remove from your dog’s diet is important. But what you add matters just as much. If today’s list has you thinking more broadly about your dog’s overall nutrition, the quality and balance of every meal shapes their coat, energy, gut health, immune resilience and longevity.

Our Canine Nutritional Gap Analyser shows you exactly where your dog’s current diet is falling short — analysing what you already feed and identifying specific gaps with practical guidance. Once-off at N$249.

If you’re already feeding raw or thinking about starting, the free Raw Feeding Calculator gives you correct BARF ratios and daily portions for your specific dog. No login, no payment — just accurate guidance.

For dogs managing a chronic health condition, Canine Health NutriCraft™ provides therapeutic nutrition planning for kidney disease, liver disease and pancreatitis — from N$199/month.

And if you’re ever unsure whether a herb or plant is safe, our free Herb Safety Checker gives you instant results for any species. No login required.

Your dog cannot read food labels. You can — and that makes all the difference. 🌿