Dogs don't get the concept of rape, anal or otherwise. And it certainly could have protected itself by spinning around and snapping. Instead, it chose to use its teeth to make contact and maul a human.
Given the context, from a human perspective, the guy got what he deserved. But that doesn't change the fact that this animal is a danger to humans.
Nonsense.
Utter nonsense. Female dogs will rebuff the advances of a male they aren't interested in, with teeth, if necessary. Male dogs will, on rare occasion, mount another male to settle matters of dominance once and for all. It does not appear to be a consensual act, and the nondominant male will either leave or slink away.
Even a dog knows that some parts don't belong in some places. It might not understand legal terms, but unnatural acts are, well, against nature, and that much the dog understands.
Self defense is a natural act, and the dog will defend itself.
For the guy to get mauled, he likely wasn't just waving his 'willie' from behind a trench coat, he'd have to be without clothing, fully exposed enough to take a poke, and insistent. That would leave him open to damage because there would be little between him and the dog's teeth but the rest of the dog at the time of the offense.
You think this dog is a danger to humans, but there is apparently no history of it harming anyone who wasn't trying to stick their penis in the out door.
I think this dog has rendered a public service to dogs and God only knows what other creatures (or humans, even) who can sleep more soundly because a sexual predator who has no rules has been taken out of play.
I'm with
@sneakypete