Bull culero. Dogs aren't people, they're animals that have been specifically bred for a purpose. Let's take Collies for an example since I have two of them. My three year old is shy and timid yet very personable once you get to know him. He came from an abusive home. My one year old that I've had from 8 weeks old is curious but still reserved in unfamiliar situations. He's happy and energetic, always ready to play. Two different dogs, two different personalities. The common ground they share is their INSTINCT, the purpose they were bred for. Both of them when placed with a group of animals will round them up into a tight circle without giving it a second thought. Herding dogs herd, it's what they're geared for.
Border collies are excellent examples as well. Well meaning families with small children and not a whole lot of time on their hands get one because they're supposed to be really smart and housebreak easy. Inevitably the dog gets bored and takes to herding the kids. It's not upbringing or the owner's fault (except for getting the wrong kind of dog), it all comes back to the dog's instinct that has been bred in for years.
Raise a beagle from a pup and then drop him on a trail two years later. I'll bet he takes off after the first rabbit he smells. Check out a German Shorthair when he hits a field of birds for the first time. Something inside him makes him freeze in position and point his body at the quarry. It's the same thing that can take over a pit bull's mind at any given moment. I've seen it with my own eyes. A person can take a dog of any breed and train them to be mean, but some dogs have the instinct to kill firmly planted in their genes. It's not upbringing, socialization or anything of the sorts, it's INSTINCT. It's the same reason you can't raise a tiger cub on your own and be completely safe from an attack later in life.
Cougar
