I was once in Argentina and I saw a pack of what looked like wild wolves, but they were actually all dogs, but they were kind of roaming and looked like they were hunting as a pack. It was pretty interesting and definitely kept me on my toes.
You will find dogs mating in the street everywhere you go. Don't be surprised, they're not wrestling, I promise. They are very also responsive to rocks. The kids have taught them well, so if you ever get a dog coming at you to chase you or bite you, bend down like you're picking up a rock and the dog will run away. It knows you're going to throw a rock at it.