Diamond Jim

So tiny and yet living so large (note the four month-old's cush home and blinged-out leash).

In a rush, the Muttropolitan Diarist didn't have time to learn if this tiny little mouse of a dog was named for Diamond Jim Brady, a hugely successful (and just plain huge) New York railroad man.

http://en.wikipedia.org/wiki/Diamond_Jim_Brady

Clearly, there's not much in the way of physical resemblance.