I've not seen any carnivores that can resist the scent of the oil from a can of sardines.
I eat the sardines and soak a cotton ball in the oil then hang it from a bush or a stake a few feet above ground.

When using it as bait for live traps I make trails leading into the trap by dragging it several feet in front of the door.

One shot, one kill........ It saves a lot of ammo!