In December, 2013 Facebook announced that links to external websites will be given higher rank in the Newsfeed than other types of content. Moreover, they are going to place additional emphasis on posts that have conversations (Comments).
This is good news for Pet Chance clients, since Pet Chance is an 'external' site. Our Chance posts are therefore more likely to show up more often in newsfeeds.
Since Facebook is going to re-display posts that have Comments in them, you are strongly encouraged to start (and nurture) conversations about your Pet Chance posts. In addition to asking people to Share/Like - add updates (if you're the pet owner), ask questions, make suggestions, or anything else you can think of to keep the conversation going. This will help keep the Chance in more Facebook Newsfeeds for a longer time.