3% Hydrogen Peroxide 4oz Bottle.  Primary use is to induce vomiting, in dogs ONLY,
if they ingest a toxic substance that is not caustic.  Refill bottles come with a custom label with dosing instructions.
Hydrogen peroxide is NOT recommended to clean wounds in dogs, because it can damage the skin, delay healing, and can be painful.   
NEVER give hydrogen peroxide to cats, it can be fatal.