Well some facts on Hydrogen peroxide
Hydrogen peroxide - Wikipedia, the free encyclopedia
It can be dangerous unless used properly. We can only use 3% solution of it safely.
Hi Mahiruha
It is not at all harmful and can be safely applied to even exposed flesh to dislodge dust etc and can be purchased at any Chemist shop.
Even the link provided by you, it is nowhere stated that it is dangerous. Infact, I'm producing an extract from the text from very same link which proves that it is even safe to ingest it albeit in small quantities.
Quote "If a dog has swallowed a harmful substance (e.g., rat poison, chocolate), small amounts of hydrogen peroxide can be given to induce vomiting." Unquote