Hellhound

Hellhounds are robotic wildlife from the Generation 1 continuity family.

Mmmmm-mm-mm-mm, blues fallin'; down like hail/blues fallin'; down like hail/And the day keeps on worring'; me, there's a hell-hound on my trail...

A hellhound is a type of canine mechanoid native to the planet Cybertron. It possesses considerable battlefield prowess and is at least semi-domesticated in service to Decepticon hunting parties.

It is described as 'soulless'.

Fiction

Marvel UK comics

Snarler and the Mayhem Attack Squad set a hellhound loose in Dallas, Texas to run amok, hoping to smoke out the Survivors. Instead it turned up the rogue Decepticon Carnivac, who was grateful for a target to vent his frustrations on. Way of the Warrior