Looking for someone to take down an ISIS terrorism-and-buggery target location? Send a modernized Roman legionnaire and his loyal brute of a war-dog. Sure, this Centurion is kitted up a little differently than any you'll read about in the Commentarii de Bello Gallico, but he'd be instantly recognized for his professionalism by any of the great generals who subjugated the known world.
The long existence of the Roman Empire had everything to do with the legions. While the legions were strong, Rome was strong. Conversely, the disintegration of the Late Empire had everything to do with the disintegration of the legions as effective fighting forces. Stephen Dando-Collins
As for that dog, consider what Publius Flavius Vegetius Renatus tells us.
"Never, with them on guard, need you fear for your stalls a midnight thief, or onslaught of wolves, or Iberian brigands at your back."