Pigs

Urban dictionary is not very keen on giving the etymology of their definitions for their slang vernacular and thus to discern how officers of the law came to be nominally and vulgarly associated with swine is not exactly clear. I suppose George Orwell may be slightly behind it all with his "Animal Farm" fiends being of the swine variety - though the term "pig" has almost certainly been an insult of animal reference for millennia.  Pigs are most assuredly not kosher but that likely has a lot to do with the fact that they readily wallow in the mud and just as readily return to it after an obligatory trip to the wash house. If you refuse to put pig protein in your veins via your stomach via your mouth you may not have to be a candidate for putting pig heart valves in your own after heart valve surgery. Pigs are also deceptively intelligent in the order of animals and may not be as frisk as your pet dog but could probably beat him in a game of wits, though I'm not quite sure what a game of wits for a dog and pig would look like, though I doubt severely it would be chess or even backgammon. For some very odd reason which I have a most insurmountable time understanding certain females of my species have the upmost adoration and affection for small pigs and I have yet to be enlightened on the matter and doubt whether it is possible to be so, though not everything I have done in the fast, including affections held has been within the realm of the rational. Of all animals everywhere and all time, if I had to become one, I would last of all choose pigs...but not just any pigs, but those in particular of the Gadarenes in first century Judea. 

"A large herd of pigs was feeding there on the hillside. The demons begged Jesus to let them go into the pigs, and he gave them permission. When the demons came out of the man, they went into the pigs, and the herd rushed down the steep bank into the lake and was drowned." (Luke 8:32-33)