Paw and Order by Spencer Quinn (OneClick audiobook).
A Chet & Bernie Mystery. Bernie’s girlfriend, a reporter in Washington, is working on a big story. When her source runs into trouble, Bernie and Chet get involved but are soon out of their depth. Regular private eyes usually do not deal in international conspiracies. Chet narrates this series, and since he’s a dog, even the most serious situations can be funny. To start at the beginning, check out “Dog On It.”