Grapes are a delicious and healthy treat. Grapes have high levels of antioxidants, vitamins, and minerals that can help protect against cardiovascular diseases, eye problems, cancer, and more. While these fruits are safe for some animals, such as birds and raccoons, many domestic animals, such as dogs, find them disagreeable. Grapes and raisins should not be fed to your dog, because it can put them in harm’s way. So, what exactly do grapes do to dogs?  

Why Are Grapes Toxic to Dogs? 

It is not known exactly why grapes and related snacks, such as raisins and sultanas, are toxic to dogs. However, what is certain is that these fruits are a health hazard for dogs. Although not all dogs may have the same reaction, grape toxicity can cause acute kidney failure and decreased urine production. Dehydration commonly occurs. Unfortunately, since the exact toxin responsible for kidney failure in dogs is unknown, there is no specific antidote and supportive care is the only viable treatment. Furthermore, the effects of the toxin may take up to three days before your dog starts to exhibit symptoms and after an extended period, your dog may have life threatening symptoms. 

Grape Poisoning Symptoms  

If your dog has consumed grapes, it is important to seek medical attention immediately. Symptoms of poisoning usually appear within 12-24 hours of ingestion, but can take up to three days to show in some cases. If left untreated, grape poisoning can lead to acute kidney failure, which can be fatal. Common poisoning symptoms include:  

  • Dehydration  
  • Dribbling urine  
  • Vomiting  
  • Abdominal pain  
  • Bad breath  
  • Lack of appetite  
  • Increased heart rate  
  • Excessive thirst  
  • Excessive urination  


If your dog has eaten grapes, raisins, or snacks made with these products, take action straight away, even if you don’t notice clinical signs of poisoning. Contact Pet Poison Helpline® at (855) 764-7661 for assistance. They can answer your questions and concerns. Grape poisoning treatment may involve administering activated charcoal to absorb toxins in the intestinal tract, IV fluids to help urine formation and prevent kidney failure and putting your pet on a dialysis machine to help support the kidneys. Even though experts are not sure what causes poisoning from grapes, what we can be sure of is to avoid giving your dog grapes altogether.