Sometimes, okay most of the time, drawing a cartoon comes far easier to me than writing the dialog. The key to a good cartoon is less is more. You can kill a cartoon by trying to be too profound. These examples tell stories that don't need to be novel length. One, oneline mating, another might be a farthers advice to his son about not staring into the headlights. The turtle and the rabbit might be conspiring to fix a race and the two foxes planning to raid a chicken bbq to avoid working too hard for their dinner. Feel free to come up with your own ideas.