Full sized dogs can kill and eat a human. Full sized sand cat (or whatever they began as) can't eat a human. It's another domestication filter: "can't be able to easily eat a human".

Years ago I was walking along the beach on a pacific island (probably Rarotonga). I'd noticed dogs running about (individually, not in a pack) and remarked how docile they seemed. Mentioned this to a local I ran into to which he responded "any that wasn't docile went in the Umu".