There is a kind of gauze pad that is especially good for cleaning wounds. I used is when I had an infection after the removal of a cyst. It is made by Johnson and Johnson and it has First Aid on the box. Then it says Extra Absorbent Gauze Pads for Cleaning and Covering Wounds. The peroxide shouldn't be that painful. Because she licks it, I think I'd want to check with the Vet to make sure whatever you put on it won't hurt her if she licks it off.