I thought about this briefly, but pigs are mostly defensive fighters, whereas dogs are streamlined predators.
However, there is another idea. Dogs are invariably used for police matters in a 1:1 ratio with their handlers. But what if you trained an “attack pack” of dogs?
Wolves are optimized when they hunt herd animals as a pack, and if part of the herd is trapped they will occasionally perform a “sport kill”, which goes against the “sick and lame” idea, and takes out a bunch of healthy, adult animals, oddly enough ignoring the young and older animals.
To train a pack of dogs to do this sort of thing against rioters would both be possible, and really break up the riot in a hurry. In effect, members of the pack would each get half a dozen deep, bleeding bites on one rioter before moving on to the next one.
Simulated “sport kills” as far as the dog was concerned, as long as the rioter laid down and stopped moving. Once down, stay down, or the dogs may attack them again.
From Wiki:
War dogs were used by the Egyptians, Greeks, Persians, Sarmatians, Alans, Slavs, Britons, and the Romans. [1][2] The Molossian ‘Canis Molossus’ dog of Epirus was the strongest known to the Romans, and was specifically trained for battle. [3] Among the Greeks and Romans, dogs served most often as sentries or patrols, though they were sometimes taken into battle. [4] The earliest use of war dogs in a battle recorded in classical sources was by Alyattes of Lydia against the Cimmerians around 600 BC. The Lydian dogs killed some invaders and routed others. [5] Often war dogs would be sent into battle with large protective spiked metal collars and coats of mail armor. [citation needed] Native Americans also used dogs as pack animals and to pull travois. [6]
During the Late Antiquity, Attila the Hun used giant Molosser dogs in his campaigns. [1] Gifts of war dog breeding stock between European royalty were seen as suitable tokens for exchange throughout the Middle Ages. Other civilizations used armored dogs to defend caravans or attack enemies. The Spanish conquistadors used armoured dogs that had been trained to kill and disembowel natives. [7]
I thought about this briefly, but pigs are mostly defensive fighters, whereas dogs are streamlined predators.
I still like the idea of pigs used against Muslim rioters. As I mentioned, they can be trained and rioters screaming and charging would be enough to raise their hackles.