You have a few options.
First remember almost nothing can eat only meat, hypercarnivores are very rare.
If they are more like omnivores, AKA wolves and creodonts, you go with a lot of leftovers. You feed them the leftovers and carcasses of meat animals, mixed with grain and vegetables, think pigs or dogs.
If they really are hypercarnivores, go for fish. Fish are a lot more efficient than most meat animals you can farm. as a bonus many farmed fish can be fed damn near anything. If you are going premodern then you can get massive fish hauls, prior to modern times net fishing could yield so much fish and shellfish would be used as cheap fertilizer.