Note: Spock on Star Trek had a similarly named sehlat which was also a large fanged pet. Like Barsoomians generally, they prefer low terrain.
The solar eighth ray would be absorbed by the surface of Barsoom, but the Barsoomian eighth ray, which tends to propel light from Mars into space, is constantly streaming out from the planet constituting a force of repulsion of gravity which when confined is able to lift enormous weights from the surface of the ground.
Note: Tony Stark would later make great use of repulsor rays as Iron Man.