Nasty, dangerous, and completely ready to finish off anything that comes into their clawed and fanged purview. The sand rat is found throughout many different world,a pest of a bygone age when Atlantis might war fleets sailed the deepest depths of space and these little four foot tall horrors stowed away aboard the mighty void ships. Sand Rats are a degenerate species of nasty and dangerous xenophobic and hate filled aliens. They lost their planetary empire decades ago & now have spread throughout the planes. Sand Rats worship any number of chaotic gods & degenerate Lovecraftian entities.
Other areas of sand rat infestations have their ruins, space dungeons, & other areas swept clean of any debris to attract adventurers. There is a bounty on space rates of 1d20 gold pieces per rat in many space ports. Several alchemist's cabals will pay good money for space rat carcasses because of the powerful stomach acids of space rats can be used to make space craft bulk head cleaners. These alchemists will pay 5 gold pieces for an intact space rat corpse. The space rat acidic cleaner does 1d6 points of damage to any surface its put on & sells for 1d10 gold pieces for a glass vial.
Space rats have been found in very odd planar places such as the further reaches of the 'Lovecraftian Realms' & the planes of Giger. Sand Rats are of a low deviously evil intelligence, dangerous, & make highly effective guards for unholy temples & shrines. Therefore brain lashers & many lower tier Lovercraftian races use them as guards.