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The Sabertooth was the disguise of a real tiger.
It appeared to be a sabertooth tiger with long fangs.
It was a wild animal. It proved to be less fierce than the feral cats also roaming the preserve.
Scooby-Doo! (DC Comics)
Mr. Farnham put fake fangs on a tiger to create Sabertooth, to drive Dr. Herriot off the land so he could reclaim it and then sell valuable prehistoric artifacts and fossils that were preserved in a cave on the land.