If it’s going to work, your dog will vomit within 10 to 15 minutes. If you can, give your dog a small meal before you administer hydrogen peroxide. If it doesn’t work, it can be done again.
What happens if my dog has hydrogen peroxide and doesn’t throw up?
If it has taken more than 15 minutes for the hydrogen peroxide and vomiting to occur, you can re-dose. If your dog doesn’t vomit, don’t give him hydrogen peroxide. There is a chance that this could lead to an overdose.
What happens if you give a dog too much hydrogen peroxide?
If you give a large amount of Hydrogen Peroxide that is not 3% concentration, it can cause severe irritation to your dog’s stomach that can lead to more serious illnesses.