Amores perros (2000)

I believe the title must translate as When Terrible Things Happen To Terrible People. It's a Dogme-esque film set in "Iberian America." Karma: former college professor, 20 years before, had dropped out, leaving wife and child, to become a guerilla. Now living outside society but in it, he saves a nearly dead fight dog. But while the man was away from his hovel, the recovered canine has killed or maimed most of the other dogs he cares for. The vicious dog represents violent radicalism which ideological belief allows to flourish - with devastating results.

(Metacritic rating: 83)