OK, OK — we get it. The selfie trend almost went away, but — bam! — it's back and better than ever. In 2014, the word itself made it into Webster's Dictionary, and animal selfies led a National Geographic ad campaign. No offense to duck faces, but Nat Geo was on the right track with the whole animal selfie thing. It turns out that there's a whole world of #petselfiez waiting to be seen. Ahead, check out 21 of our favorites. Woof!