* Large wild cats (like lions, tigers, leopards, jaguars): Yes, these cats are big enough and powerful enough to take down deer. In fact, deer are a common prey for these predators.
* Smaller wild cats (like bobcats, lynx, cougars): Yes, they can and do hunt deer, but they typically go after fawns or smaller, weaker deer. Adult deer are too large for them to take down easily.
* Domestic cats: No, domestic cats are too small and don't have the hunting instincts to take down a deer.
So, the answer depends on the specific cat. However, in general, larger wild cats can definitely eat deer.