I think a jackal with exaggerated features would be a really fun addition! Like the Egyptian depicted jackals with short almost smooth fur and incredibly angular designs. Or a breed a bit like the Xoloitzcuintli Quetzal
Shepherd/Alsatian type markings, with the classic back saddle for upper, classic mask and / or “beauty marks” (those dots on their faces) for the accent, and a “black and tan” style for the unders, so eyebrows, muzzle, chest patch(es), and lower legs/inside legs.
A piebald or whitemark accent, possibly similar to pinto/paints in horses.
Leopard rosettes (Custom apparel is a great tool to have buuuuut limited)
“Minimal spotting" unders where only the tail tip, toes, and a small chest spot is colored, modeled after minimal white seen in many canines wild and domestic
Seconding the appaloosa rear end blanket marks. Leave “holes” in the marking to expose the base underneath.
Breeds:
African wild dog anatomy-styled breed. Gotta love them big round ears.
Seconding the corgi/sweedish valhund/insert long stumpy legged anatomy dog here.