Hotel for Dogs : 'Central City'?

'Central City'?

In some places you can see references that the fictional name of the city is "Central City". Is this a nod to the DC-Universe (http://en.wikipedia.org/wiki/Central_City_%28DC_Comics%29) by the filmmakers or was it called already Central City in the book?

At the very end of the movie "Aquaman & the Flash" and "DC Comics" is credited.
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