alot of it it's also not very unique eg;
http://www.google.com.au/search?q=%2...iated%22&hl=en
http://www.google.com.au/search?hl=e...+Dogs%22&meta=
Google will only list a few sites, not all affilate sites any more if they all have the same content.
as you would be able to see via the links posted above, Google will send most affiliate sites that aren't seen as the original source to the supplemental index.
a site like
www.1800petmeds.com Google seems to be ranking, that site has alot of the exact same content as your pages.. so Google has probably given that site a tick as being a possible original source of the content and anything that tries to duplicate that authority website has no chance, unless copywriting is done.
just my opinion of course.
