Inspired by these two posts (https://www.classicfm.com/discover-music/humour/bolivian-monastery-adopts-stray-friar-dog/ https://cuteness-overload.com/post/.....s-submit-your) and some ideas from friends I thought of an Avatar AU where everything is the same except Aang adopts a puppy and dresses her up in little air nomad clothing.

Her name is Melon and she gets along well with Appa and Momo. Aang and Katara absolutely dote on her.