Layton Mystery Tanteisha: Katori no Nazotoki File

Taking place during the events of Millionaires' Conspiracy, the series follows Katrielle Layton, daughter of the renowned Professor Hershel Layton, who has set up the Layton Detective Agency alongside her self-appointed assistant, Ernest Greeves, and a talking dog she dubs Sherl. Together, they take on all kinds of requests to solve mysterious cases troubling their fellow Britons.

(Source: Wikipedia)