Pygmy Puff

A Pygmy Puff is a miniature Puffskein, bred in the back of Fred and George Weasley's shop Weasleys' Wizard Wheezes at 93 Diagon Alley in London, and sold there as one of the known products in the WonderWitch range. It is one of their more popular products, as George said they were having trouble breeding them fast enough for the demand. Ginny Weasley bought a purple Pygmy Puff named Arnold in 1996, which she frequently played with at Hogwarts.

Characteristics
Pygmy Puffs resemble little fluffy balls that roll around, squeak, and come in various shades of pink and purple. Luna Lovegood ( AKA Loony Lovegood) believed that all Pygmy Puffs sing on Boxing Day.

Behind the scenes

 * A Pygmy Puff is a new breed of magical creature, and creating new breeds of magical creatures is against the law. However, as it is merely an undersize Puffskein, this may not count as an offence.
 * Pink and purple Pygmy Puffs plush and keychains are available for purchase at The Wizarding World of Harry Potter at Zonko's shop (there’s the naming ceremony, a mini-show that accompanies purchasing a pygmy puff plush, in which a shopkeeper will ring a bell and announce that you have adopted one and sometimes, the name you have chosen for yours) and on the Official Online Merchandise Store of the park. The plush measure six inches (15.25cm) in diameter (that seems to be a pretty big diameter considering that Aronold in the books can ride Ginny's shoulders and that a nest of dead puffskeins, that are bigger than pygmy puffs, has been found under a sofa where there is not a lot of space). The keychains diameter (approximately 2 inches) is smaller and seems more appropriate. Some Pygmy Puffs plush are in pink cages, exacly like in the movie.
 * A Pygmy Puff shirt is also available in the theme park at Zonko's Joke Shop. The shirt inscription : "Miniature Puffskeins - Pygmy Puffs - Peacefully Pet the Puffs", is the same inscription we can see on the pygmy puff cage's label in Harry Potter and the Half-Blood Prince (film) during the Weasleys' Wizard Wheezes shop scene.
 * Despite the blanket ban on the Weasley's Wizard Wheezes products on Hogwarts, Ginny somehow managed to bring Arnold with her into Hogwarts. This may be because the Pygmy Puffs are not joke items and that the ban Argus Filch placed on Weasley's Wizard Wheezes may only affect their joke products.

Appearances

 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Half-Blood Prince (film)
 * Harry Potter and the Half-Blood Prince (video game)
 * The Wizarding World of Harry Potter
 * LEGO Harry Potter: Years 5-7

Notes and references
Boursouflet Карликовый пушистик Puszek Pigmejski