Sherl is a dog appearing in Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy. He is the assistant dog of Katrielle Layton and is apparently able to talk.
Sherl first meets Katrielle shortly after she starts her new detective agency. He immediately decides to test her by giving a puzzle for her to solve. After she solves the puzzle, Sherl explains that he has amnesia and would like Katrielle to find out who he truly is. Since he does not remember his own name, Katrielle names him "Sherl O.C. Kholmes", after the famous detective Sherlock Holmes.
- Sherl resembles a Basset Hound.
- Due to Sherl's ability to talk, he may be related to the "Subject" animals in Professor Layton and the Unwound Future.
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