Ornithosuchus in GURPS

A distant relative of crocodilians, the 'bird crocodile' was a long-legged reptilian predator which lived in North-Western Laurasia (the continent which would later split to form North America and part of Europe) during the late Triassic. It was fully terrestrial and warm-blooded, typically walking on all fours but lifting its fore-legs off the ground to sprint. Its triangular head tapered to a narrow snout, bristling with teeth, some of them long enough that the opposite jaw was shaped to allow them space to stick out.

Ornithosuchus

ST 14; DX 12; IQ 3; HT 12.
HP 14; Will 12; Per 11; FP 12; Speed 6.00; Dodge 10; Move 6.
SM +2 (4 hexes), 320-360 lbs.

Bite (14): 1d+1 impaling.

Traits: Bad Sight (Low Resolution); Born Biter 2; Discriminatory Smell; DR 2; Enhanced Move 2 (Ground Speed 12; Costs Fatigue, 1 FP/second); Extra Legs (Four Legs); Limited Camouflage; Night Vision 2; No Fine Manipulators; Reduced Consumption 1 (Cast-Iron Stomach); Resistant to Disease (+3); Striking ST 1 (Bite Only); Temperature Tolerance 2 (Heat); Wild Animal.
Skills: Brawling-14; Survival (Desert)-12; Tracking-15.

Other members of the ornithosuchidae family were similar but smaller (35-50 lbs.) which would reduce ST and HP to 7 (which changes bite damage to 1d−3), SM to +1 (2 hexes), and DR to 1.

Note: although it may seem to qualify for Semi-Upright due to shifting from four to two legged stances as needed, the rules do no not support it moving faster on two legs. Therefore I gave it Extra Legs and No Fine Manipulators, but not Horizontal.