What Can Dogs NOT Eat?

Chocolate is one of the most well-known toxic foods for dogs, but many owners don’t realise just how harmful it can be. It contains theobromine and caffeine, both of which a dog’s body struggles to break down. [1]

Symptoms of chocolate poisoning can appear within a few hours and may include dog vomiting and diarrhoea, restlessness, rapid breathing, an increased heart rate, tremors, or seizures. Dark chocolate, baking chocolate, and cocoa powder are the most dangerous because they contain the highest concentration of theobromine.

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Grapes and raisins are among the most dangerous human foods for dogs. While the specific toxin hasn’t yet been identified, we do know that dogs can react severely to even tiny amounts, in some cases, just a single grape.

Toxicity can lead to rapid-onset kidney failure, which may develop within hours. Symptoms include vomiting, lethargy, diarrhoea, and reduced urination. Because reactions are unpredictable and can be life-threatening, all grapes and raisins should be considered unsafe for dogs.

Onions are toxic to dogs in all forms (raw, cooked, dried or powdered) and contain compounds that damage red blood cells, leading to haemolytic anaemia. Researchers have observed this toxicity with cooked onions. [2].

Symptoms may include weakness, vomiting, pale gums, rapid breathing, and collapse. Because the toxic effect is cumulative, even small amounts eaten over several days can become dangerous.

Onion powder is especially risky as it’s concentrated and often hidden in soups, gravies, seasoning blends, and ready-made meals.[3]

Xylitol is a highly dangerous artificial sweetener found in sugar-free gum, sweets, baked goods, chewing mints – and even some peanut butters. In dogs, it can trigger a sudden, life-threatening drop in blood sugar and can rapidly lead to seizures, collapse and acute liver failure. [4]

Even tiny amounts are enough to be fatal, so always check labels and keep xylitol-containing products well out of reach.

Macadamia nuts are toxic to dogs, [5] even in very small quantities. They can trigger sudden weakness, tremors, fever, vomiting and difficulty walking, symptoms that often appear within hours.

Although the exact toxin isn’t fully understood, the effects on a dog’s nervous system and muscles are clear and can be severe. Always keep macadamia nuts and any foods containing them well out of reach.

Cooked bones are a serious hazard for dogs. Once heated, bones become brittle and can splinter easily, causing choking, broken teeth, internal blockages or even life-threatening perforations.

They offer none of the nutritional benefits of raw bones and come with all the risk. For safe, species-appropriate alternatives, read our full guide to bones for dogs.

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Raw bread dough is extremely dangerous for dogs. Once eaten, the yeast causes the dough to expand inside the stomach, leading to painful bloating, pressure on internal organs and potentially a life-threatening blockage.

Even worse, the fermenting yeast produces alcohol, which can trigger alcohol poisoning, causing disorientation, vomiting, seizures and dangerously low body temperature.

Mouldy or spoiled foods are far more dangerous to dogs than most people realise. Certain moulds produce tremorgenic toxins – potent compounds that can trigger severe neurological symptoms, including shaking, muscle tremors, disorientation and seizures. [6]

Even small amounts of spoiled food can cause rapid onset poisoning. If it’s past its best or smells even slightly “off,” keep it well away from your dog’s bowl.

Corn on the cob might seem harmless, but the cob itself is a major danger to dogs. Even if it’s chewed, the dense, fibrous core does not break down in the digestive system and can easily cause a serious intestinal blockage.

Symptoms often include vomiting, abdominal pain, loss of appetite and dehydration, and in many cases, surgery is the only solution.

Salt and salty snacks can be risky for dogs because they’re much more sensitive to sodium than we are. Too much can lead to excessive thirst, dehydration and, in severe cases, sodium poisoning, causing vomiting, tremors or weakness. Crisps, salted nuts and cured meats are best kept well away from your dog’s bowl.

Fat trimmings and deep-fried foods are far too rich for dogs and can overwhelm their digestive system. High-fat foods can trigger pancreatitis in dogs, a painful, potentially serious inflammation of the pancreas, leading to vomiting, stomach pain and loss of appetite. It’s best to avoid giving dogs greasy leftovers or the skins from cooked meats, as these can be difficult to digest and offer little nutritional value.

Small amounts of lean, cooked meat are generally fine, but it’s important to understand the difference between beneficial fats and those that can cause problems. Whenever possible, raw meat is the preferable option, offering natural nutrients in their most digestible form. You can learn more in our guide. “The Truth About Fats For Dogs”

The Truth About Fats for Dogs: The All-You-Need-to-Know Guide

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Artificial sweeteners (other than xylitol) can still cause problems for dogs. Many sugar substitutes can irritate the digestive system, leading to gas, bloating or diarrhoea, while others may carry a risk of toxicity in larger amounts. Because ingredients vary widely, it’s safest to avoid giving dogs anything containing artificial sweeteners altogether.

Fruits like cherries, apricots and peaches can be risky because their pits contain cyanide, a toxin harmful to dogs. The pits also pose a choking hazard and can cause intestinal blockages if swallowed. Always remove the stones completely or avoid these fruits altogether.

Many dogs struggle to digest lactose, meaning dairy products can easily lead to stomach upset, gas or diarrhoea. Even small amounts of milk, cheese or creamy treats can cause discomfort in sensitive dogs. It’s best to offer dairy only with caution or opt for goats’ milk which is lower in lactose or skip it altogether.

Nutmeg contains a compound called myristicin, which is toxic to dogs and can affect their nervous system. Even small amounts may cause disorientation, elevated heart rate, tremors or, in more serious cases, seizures. It’s best to keep nutmeg and nutmeg-containing foods well out of reach.