Dogster
dogster.com
It was only a matter of time before someone created a Friendster for dogs, and this one is too goofy to resist. The site is easy to use—each pup gets a home page, complete with profile, photos and links to all his pals. (What's hard is explaining yourself to the not-so-crazy-about-canines crowd.) Special tool buttons to give a treat, invite friendship, send a message or read a diary.