Looks good!

There are a few issues though (hope you don't mind, just trying to help ):

On the about us page the bottom two paragraphs are quite a way apart.

On the kittens page, there are a few issues with the bulletpoints, the points are appearing over the text on the page.

There are also a lot of html errors, which will get you marked down on Google and other search engines.
[Invalid] Markup Validation of http://www.purrfactor.com/ - W3C Markup Validator