Metriacanthosaurus is a theropod dinosaur... even with what little is known, that's pretty conclusive which makes a basic restoration possible... and let's not pretend Metriacanthosaurus was added for any reason beyond the claim that it's a canon addition.Ok then, Metriacanthosaurus for example then...
Andrewsarchus is a... what now? Oh that's right, we don't know... nowadays we think it might be an entelodont, but that remains inconclusive; some think it might be closer to hippos. And even if it were an entelodont, it would make way more sense to go with something obvious, with a reliable restoration like Entelodon. There's literally no reason to prioritize Andrewsarchus other than some outdated restoration that's no longer considered valid.
Megatherium are thought by some to be omnivorous... speaking of omnivores, entelodonts like Daeodon were pretty big and probably enough to take on a Smilodon.I meant carnivorous as well.
If you're looking for true carnivores, the bear dog Amphicyon or the creodont Hyaenodon may have been a match for a Smilodon, especially considering how specialized a Smilodon is.
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