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Hi there and welcome to Just answer!! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
To induce vomiting, the peroxide should be given at 1 teaspoon per 10 pounds of your dogs weight and this should do this within 10 minutes, If she does not vomit within this time, try again. If this does not cause Princess to vomit within another 10 minutes, then take her to your vet, More hydrogen peroxide could be toxic to her and your vet will have an injection that will accomplish this....
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