Ever look at a pug and think, "dude, your ancestors were wolves! What happened?!" Humans first began selectively breeding dogs between 15,000-30,000 years ago, and by around 10,000, the Saluki had emerged as a distinct variety. It's now considered by the Guinness Book of World Records to be the world's oldest dog breed, due to historical evidence of its popularity and its close genetic link to wolves. A seminal sighthound, the Saluki was bred to hunt hares and gazelles over desert terrain, but now they mostly hunt cuddles and couch time.