There are no credits on the version of the Tom and Jerry cartoon ‘Dog Trouble’ (1942) on DVD, save the directors and producer, but Irv Spence was hard at work. A few frames from one of his scenes.
In showing these to animator Mark Kausler, he says “Don't forget the masterful skill of the cel painters and inkers, who took a pencil scribble and made a colorful smear that supports the action.”
George Gordon, Jack Zander and Pete Burness also animated on the earliest Tom and Jerrys but Spence has the reputation of the most uninhibited animation of the group. You can see why.