The homepage should default to "layout-filter.psd" and then allow the site visitor to switch to "layout-filter-2.psd".
Clicking on a listing will take you to the "layout-animal.psd" file. Please Note: For the Animal page, I'd prefer to not have the gray background behind the listing information, images, etc. Leave it as solid white to be consistent with the homepage.
There should be 2 final HTML files. Homepage and Animal.