This lightly built typical fox is about the size of its North American cousin, the Red fox (Vulpes vulpes). In the Western Cape research has revealed that around 10% of the stomach contents of sample animals have been preying on small lambs. (Bear in mind though, that it is not possible to tell whether it killed a live lamb or picked up a dead one.)
Most live stock farmers have an attitude of indifference about them, as opposed to an active pursuit of the Black-backed jackal. I let them go when encountering them on night calling, unless the farmer assures me that it is the culprit.
Cape fox can easily be confused with juvenile Black-backed jackal, so take care when night calling for predators.
By inspecting the carcass of a sheep, one can usually tell what had killed it, by simply looking it the spread of canine teeth punctures on the sheep’s throat. Cape fox is about 15mm, Black-backed jackal about 25mm, and feral dogs about 35mm or more.