A Kneazle is a magical creature, similar to a cat in appearance. They have spotted, speckled or flecked fur, large ears and a lightly plumed tail, like a lion. They make excellent pets if they like a Witch or Wizard. They are very intelligent, independent and occasionally aggressive, and have an uncanny ability to detect suspicious and distrustful people. They can also safely guide their owner home.

Kneazles can interbreed with normal cats, and generally have up to eight kittens in every litter. Kneazle owners are required to have a license to own the animals. Some Witches and Wizards make a living by breeding Kneazles or part-Kneazles.
Niffler (XXX)

A Niffler is a treasure-hunting creature resembling a porcupine with a long narrow snout. They are very attracted to shiny things, which makes them wonderful for locating anything metallic or shimmery, but they might bite if a person is wearing jewelry. Nifflers are kept by Goblins to burrow for treasure.

Nifflers are gentle creatures, and can be affectionate to its owners but will also destroy belongings and property if kept in a house. Nifflers live twenty feet below the ground in lairs, and can produce six to eight young in a single litter.