Personally I'd take a look at where it does well on certain Google search terms and then try to build and scrape data from other websites that you could use (le

Personally I'd take a look at where it does well on certain Google search terms and then try to build and scrape data from other websites that you could use (legally of-course) like pull in twitter feeds or Wikipedia articles from DBpedia. Tidy up the design and get rid of the dead wood on the site. And then flip the site in a few months when traffic starts to pick up. It's pretty much what Demand Media does. But if you are really passionate about pets and don't mind not turning it around for profit then I'd just keep it updated and try to build a community out of the niche that it has.