Grapes and raisins are both highly toxic to dogs and can cause serious illness, even if a pup eats only a single grape or raisin. New veterinary studies suggest that the likely toxic component in grapes and raisins is tartaric acid. Typically, with other poisons, smaller dogs are at a higher risk since only a small amount may cause toxicity, but with grapes and raisins, it’s hard to predict how each dog may react to the amount they ingest, as the concentration of tartaric acid in a grape or raisin may vary. Jamie Whittenburg, DVM, founder of Kingsgate Animal Hospital in Lubbock, Texas, says the main effect of eating grapes or raisins is on a dog’s kidneys—and that eating just a small amount can lead to kidney damage or acute kidney failure, requiring prompt medical treatment. The most common symptoms of grape or raisin poisoning in a dog include: Lethargy or weakness Vomiting or diarrhea Loss of appetite Increased drinking and urination (or no urine production) Abdominal pain Dehydration (signs may include dry or sticky gums, drooling, thick saliva, dry nose, panting, and sunken eyes) Bad or strong-smelling breath Neurological signs, such as muscle tremors, a head tilt, dizziness, or seizures Due to varying amounts of the toxins in grapes and raisins, there’s no telling how many grapes it takes to create a toxic dose. Some dogs will go into kidney failure after consuming a small amount, while others will have no side effects after eating a lot more. Because it’s impossible to predict what will happen, the best course of action is to keep all grapes and raisins out of paw’s reach. Grapes, raisins and dogs just don’t mix! Pet parents should also keep a close eye on their pup to make sure they don’t go counter-surfing for foods that contain grapes or raisins, such as salads, cookies and cakes. Beyond the toxicity of grapes and raisins, these foods often have added ingredients like xylitol, which is toxic to dogs, plus considerable amounts of sugar that can also cause health problems.,Jump to section Dangers of Grapes and Raisins for Dogs What To Do If Your Dog Eats Grapes or Raisins What Human Foods Can My Dog Eat? FAQs About Dogs and Grapes