Muggles' Guide to Harry Potter/Magic/Puffskein

Overview
A spherical shaped creature, a Puffskein has a custard yellow colour fur and is found worldwide. It loves to be hugged and thrown about. It's very easy to look after this creature. It's a highly popular wizard pet and finds most of its fame with children.

Extended Description
We never actually see a live Puffskein in the books; most of our information comes from "Newt Scamander"'s Fantastic Beasts and Where to Find Them.

Mrs. Weasley does mention that she had found an old Puffskein nest under the couch at Grimmauld Place, but we must assume that they perished from neglect during the ten or so years that the house stood empty after Sirius Black's mother passed away.

Fred and George evidently breed a miniature, pastel-colored version, which they call Pygmy Puffs, and sell them from their joke shop.