Tarellian

Tarellians, also known as Tarellian Dog-soldiers, are a species of alien which appear in Games Workshop’s Warhammer 40,000 universe.

Description
Standing on average slightly shorter than a human adult, Tarellians are well-muscled creatures with broad shoulders and a long, reptilian head with a mouthful of sharp teeth. A space-faring race, Tarellians are possessed of advanced technology and a warlike nature. They are known as Dog-soldiers not only because of the similarity in shape of their heads to that of a terrestrial canine, but also due to the fact that their species operates largely as mercenaries in the 41st millennium.

History
Found as scattered groups throughout much of the known galaxy, Tarellians fought a war with the Imperium of Man several thousand years ago, a campaign which resulted in the destruction of many of their home worlds through the widespread use of virus bombs. This act bred in them a deep-seated hatred of humanity, and in the modern era the survivors earn a living by hiring themselves out as mercenary troops, especially to those who would wage war against mankind.