Is the area he is using on carpet, vinyl flooring or wood?
If it's carpet area he is still picking up the scent from the padding. If it's vinyl/wood flooring I would throughly wash the area again with appropriate cleaners for the flooring material.

Once you cleaned than use the Natures Mircle over the area it's a wonderful product.

As he been fixed? If he hasn't yet he will continue to spray until he is fixed.