If you examine a Cheetaur, you get the Saurus Rex description.
It should say: "It's a Cheetaur, a Cheetah Centaur, one of the deadliest creatures in the land. Hope you've saved your game recently."
The message file with the monster description strings is 210.msg. The Saurus Rex description is in "3, 1, 18, 1, 99". The Cheetaur description is just before that, in "3, 1, 17, 1, 99".
ScummVM version: 1.6.0git2625-gadc338c
Version: L.rry.021, 2.000