Hamster

Hamsters are rodents (order Rodentia) belonging to the subfamily Cricetinae, which contains 18 species classified in seven genera. They have become established as popular small house pets. The best-known species of hamster is the golden or Syrian hamster (Mesocricetus auratus), which is the type most commonly kept as pets. Other hamster species commonly kept as pets are Campbell's dwarf hamster (Phodopus campbelli), the winter white dwarf hamster (Phodopus sungorus), and the Roborovski hamster (Phodopus roborovskii).

Hamster in The Case of the Toxic Spell Dump
Vampirized hamsters - vampsters for short - could be used by tailors to suck bloodstains out of clothing.

Hamster in "Someone is Stealing the Great Throne Rooms of the Galaxy"
One spacefaring species in the known universe was the giant sentient hamster. Space Patrol Cadet Rufus Q Shupilluliumash and his handler Erasmus Z Utnapishtim were members of this species.