Dent, London, 1979
Republished as This Pony is Dangerous in the J A Allen Equestrian Fiction series, J A Allen, 1990
Katy is sent to stay with her godmother. Katy finds a pony in a field to make friends with, but he is supposed to be dangerous. She also makes friends with a boy who lives nearby, and his rat, and together they fight for Cassidy, and try and help Katy with her own problems.