While there are some standard humans, most of the people we see (aside from the primary cast) are humans with some vaguely canine features (the nose, mostly):
There's Chief O'Hara (no relation) in the Mickey Mouse stories:
There's the Beagle Boys, of course (their dog-like noses are a bit more prominent than usual, probably tied to their name):
And, in the Barks and Rosa comics in particular, these same creatures tend to populate crowd scenes:
(These last two images from the Don Rosa story "A Matter of Gravity").