Ada is a Miniature Schnauzer, born in England in 1997. She was trained by Barbara Gash. In 1999, she played the character of Colin the dog for the first and second series. She died on 22 April 2010, at the age of 12.
- In the credits, Ada's name is incorrectly spelt Aida.
- She was named after Ada Wong, a character in Resident Evil 2.