Carl Barks, the creator of Uncle Scrooge (and most of the extended Duck family) was usually careful to make all of his supporting characters into animals. Most important characters were ducks, (or the occasional goose), and most secondary characters were dogs.
Unfortunately, the time during which he did most of his stories was a time of strong implicit racism, and many of his most racist characters were indeed human, but might be considered sub-human enough that it made it past the Artist's notice and that of the censors as well.
When Gladstone Publishing reprinted the story Voodoo Hoodoo in their Comic Album series, editor Geoffrey Blum wrote a commentary on the initially very racist characterizations, and how the censorship process changed over time.
"Voodoo Hoodoo" was originally published in 1949.
Then...it...vanished. Had [the zombie] been a white zombie, he might
have returned before now; but Bark's comic was packed with black
stereotypes. The Disney Studio was understandably reluctant to reprint
images which in later years could give offence. For this reason,
old-time readers will notice some changes in this edition. Facial
features have been retouched, sharpened teeth are gone, and to
downplay the elements of caricature further, all the blacks have
been given dog noses like their white counterparts.
The images above were taken from
Several other images can be found there, as well.