Do cats sniff where they've sprayed or just where another cats sprayed?

[Fluffycloudland77]

You know that flehming thing they do with their mouths?.

MKitten does the Flehmen thing with feet/socks. I think they just do it with a smell that piques their interest.

If you can stand the smell, get him a valerian toy. MKitten loved it, but the hideous stink meant we had to launch it into the garden.