|Piece of Cake character|
|First appearance||September 1939|
|Created by||Derek Robinson|
|Occupation||Mascot for Hornet Squadron|
Riley is a collie owned by Squadron Leader Rex. Following Rex's appointment to Hornet Squadron, Riley becomes the squadron mascot.
Riley usually travels with Rex. A veteran flyer, Riley has clocked up to 300 hours in the air by the start of the war, although he tends to get distraught when flying above 4,000 ft.
Following Rex's death in combat, 'Fanny' Barton is forced to stop Riley's howling by shooting him in the back of the head.
Tended to empty his bladder on anyone below the Rank of Squadron Leader.