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Grapes are toxic to dogs but it depends on the amount consumed; 1 grape is not going to be toxic or life threatening to your dog.
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In cases of ingestion of poisonous food you can induce vomiting by giving hydrogen peroxide 3% 1 teaspoon per 10 lbs body weight; can be given 2-3 times 5-10 minutes apart. Max total dose is 50 mls.