Kaido is a miniature Australian Shepherd. Matty is a human (I'm guessing; he doesn't say directly). Together, they bike through the streets of New York City.
Kaido is a civic-minded dog who contributes to the well-being of his polity. He is involved with the efficient implementation of social services, such as ambulances, by howling whenever he hears the siren erupting from one.
-via Laughing Squid
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