In the first of two stories, twins Oliver and Eleanor acquire a huge, dusty egg in a junk shop and soon a baby dinosaur hatches out. They discover their pet is an echindon, the size of a chicken. In the second story, Littlest the dinosaur helps the twins with a problem.
Used availability for Terrance Dicks's The Littlest Dinosaur
July 1993 : UK Hardback
May 1995 : UK Paperback