The fat-tailed gerbil (Pachyuromys duprasi), also called the duprasi gerbil or doop, is a rodent belonging to the subfamily Gerbillinae. It is the only member of the genus Pachyuromys. These rodents are the most docile species of the gerbil subfamily. They have soft, fluffy fur. Fat-tailed gerbils have been available on the pet market for decades, but in the 21st century breeders can be hard to find. They are sometimes considered as pocket pets. Other common English names are: fat-tailed jird, fat-tailed rat, and beer mat gerbil.