
Dogs seem to be affected in different ways - I know a JRT who one of my dogs has become fascinated by since the JRT was castrated. The only other castrated dog I know of in the area is ignored by him.
The tablets certainly would be worth trying, as they won't do him any harm. You should be able to get them from Pet shops; if not it would be worth asking for chlorophyll tablets in a pharmacy. Good luck.
:)