I do have one; my favorite add-on is Catbook and Dogbook. It's like dogster except on facebook, AND you can add as many pets as you'd like. They all get their own pages and can "comment" on each others' pages, interact with other dogs, plus they just added a "dog parks" feature so you can find dog parks near you!! If your favorite dog park isn't listed, you can add it Have I mentioned I LOVE it?

catbook: http://www.facebook.com/apps/applica...?id=2358049137
dogbook: http://www.facebook.com/apps/applica...?id=2388926799

Jamie: http://apps.facebook.com/dogbook/profile/view/296084
Charlie: http://apps.facebook.com/dogbook/profile/view/296033
Double-Oh: http://apps.facebook.com/catbook/profile/view/296113