Can dogs eat raisins?
No — raisins are toxic to dogs and must never be fed to them. Even small amounts can cause serious illness or death. If your dog has eaten raisins, this is a medical emergency and you should contact your veterinary surgery or poison control immediately.
Why are raisins toxic to dogs?
The exact reason raisins (and grapes) are toxic to dogs remains unknown despite extensive research. Veterinarians and toxicologists have not identified a specific compound or pesticide that causes the poisoning. What we do know is that raisins consistently trigger a severe reaction in dogs' kidneys, and the toxicity is not dose-dependent — meaning even a single raisin or a small handful can potentially cause harm.
The danger is unpredictable. Some dogs may become unwell after eating just one or two raisins, whilst others might require a larger quantity before symptoms appear. This inconsistency makes raisins particularly dangerous: you cannot safely estimate a "safe" amount. Because of this, veterinarians recommend complete avoidance.
What happens to a dog's body?
When a dog ingests raisins, the primary target is the kidneys. Raisins can trigger acute kidney injury, a condition where the kidneys suddenly lose their ability to filter waste from the blood. This can lead to kidney failure, which is potentially life-threatening.
The damage may develop quickly or over several days. Even if a dog appears initially well after eating raisins, kidney damage could still be occurring internally. This is why any ingestion must be treated as urgent, regardless of how your dog seems immediately afterward.
Symptoms of raisin poisoning in dogs
Signs of raisin toxicity typically appear within 24 to 72 hours of ingestion, though some dogs may show symptoms sooner. Watch for the following:
Vomiting and diarrhoea (often repeated), loss of appetite, lethargy or unusual tiredness, abdominal pain (restlessness, difficulty getting comfortable), dehydration, decreased or absent urination, bad breath with a chemical smell, and weakness or collapse.
If your dog shows any of these signs after eating raisins, seek veterinary care immediately. Do not wait to see if symptoms resolve on their own.
What to do if your dog eats raisins
Contact your veterinary surgery or animal poison control immediately. This is not something to monitor at home. Provide your vet with the following information: the approximate number of raisins eaten (if known), the time of ingestion, your dog's weight, and any symptoms already present.
Your vet may recommend inducing vomiting if the ingestion was recent (usually within 2 to 4 hours). They may also administer activated charcoal to bind toxins in the stomach, provide intravenous fluids to support kidney function, and monitor kidney parameters through blood work.
Early decontamination and supportive care offer the best chance of preventing serious kidney damage. Even if your dog seems well, veterinary assessment is essential.
Prevention
Keep raisins, dried fruit mixes, and foods containing raisins (such as certain cereals, baked goods, and trail mix) completely out of reach. Be especially vigilant during baking and cooking. Remind family members, guests, and children that raisins are dangerous to dogs, as well-meaning people may not realise the risk.
Check ingredient labels on any human foods you might give your dog, as raisins sometimes appear in unexpected places.
Other toxic foods for dogs
Grapes (fresh or frozen) are also toxic to dogs and carry the same risks as raisins. Chocolate, xylitol (artificial sweetener), onions, garlic, and avocado are similarly dangerous and should be avoided entirely.
If you are ever unsure whether a food is safe for your dog, ask your vet before offering it.
Your dog's safety depends on keeping toxic foods out of their reach and acting quickly if accidental ingestion occurs. When in doubt, contact your veterinary surgery — they would always rather be called about a potential poisoning than see a preventable emergency develop.