It is possible that African golden wolves could well become cannibals in rare cases. Occasionally, a rather old leopard could well be eaten by them all. The savannah, like all ecosystems, is a vile entity focusing primarily on the survival of the fittest.
Wally and Scarlett have become mature adults, as they look pretty different from their preteen puppy days. In order to survive, they eat meat and sometimes berries, so they are not totally obligate carnivores nor hyper-carnivores after all.
Interestingly, as the drought comes back to haunt Ken's wolf family, they decide to attack a craggy old leopard and kill him, since old leopards are frankly easier targets than adult leopards or even the cubs. At this point, Ken turns twelve, as Chichi and Popo have also become teenagers.
Days later, they have to rest clear.