Our cat has a shoe fetish, Onlyme. It is mainly leather shoes, especially Laura's school shoes, and most of all when they're newly polished. She rolls on them, rubs on them, dribbles on them, sticks her face inside them, cuddles them and clutches them in her paws. I think it's the combination of leather polish and the smell of Laura's feet. What ever it is, it sends her completely loopy.
