I chose my screen name for a few reasons...

The first reason is obvious, I live in Vermont and I own a cat.
The second reason is that my cat looks like a "holstein cow cat" or a moo-cow kitty and Vermont is known to have a lot of holstein cows in it.
(just think of Ben & Jerry's ice cream logo)
The third reason is that the mascot for the college I went to was a catamount and they are also called Vermont Cats