Originally voiced by Carl Weintraub, DeSoto is a large, slender, cruel Doberman who lives in Manhattan. He is thuggish mobster goon who comes across as impulsive and short tempered. DeSoto only has 5 lines in the movie and appears during a dream sequence.

It is important we get a good imitation of the original actor. Here's a clip for reference (the audition line is at 1:29) : https://youtu.be/D-AUX1uzApU