Dogs that are unconscious cannot be induced to vomit. First off, they cannot swallow the peroxide and it gets in their lungs resulting in the potentially fatal, aspiration pneumonia. If by chance, it does get to their stomach.
What happens if a dog doesn't throw up hydrogen peroxide?
If the H2O2 works its magic, your dog should vomit within two to five minutes of receiving the first dose. If he doesn't vomit within five minutes, it's okay to re-dose. Then stop.
How long does it take for hydrogen peroxide to induce vomiting dog?
According to the canine health professionals with the AKC, 3% hydrogen peroxide will help a dog vomit within about 10 to 15 minutes. Here's the catch: The vomiting that results from this can last for over 45 minutes, so you'll want to make sure to keep your pup calm and comfortable for a while.
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