I find it funny that a lot of people say that pitbulls are inherently dangerous because of breeding, but fail to see that it is the same with people. We are all animals. I guess they have their "reasons" to argue the other way.
Sadly, you don't know the difference between natural selection and artificial selection. Human beings are the result of Nature, domestic dogs are the result of man interfering with nature. Nature would never create such thing as a pitbull or a chihuahua for that matter. They are deliberately manufactured abominations with no natural environment created solely for the satisfaction of mans desires. If domestic dogs were allowed to mate as they wished, breeds would soon become a thing of the past and they would eventually begin to all take on the appearance of a domestic wolf type dog. Artificial selection is an interfering with nature to create unnatural results. To compare dogs to humans is ridiculous, we may both be animals, but humans are far more evolved.
Dog fanciers have no trouble attributing breed specific traits for more acceptable traits in pure bred dogs. To test this, take a Pointer whose parents are good hunting dogs. Raise him for a year without ever letting him see a bird. Now put him in a field full of pheasants and see what he does. He’ll point. He doesn’t need training, encouragement or coercion to cause him to point. His genes have passed along a specific behavior - if you smell a bird, freeze. Pointers who possess this innate reaction sell for very high prices. Try telling a hunter that he paid $10,000 for a finished field Pointer that had to be taught to point. He’ll laugh at you. He paid a premium for a pedigree that assured his dog’s potential for excellence.
If you need another example, consider the Australian Cattle Dog – AKA Blue Heeler or Queensland Heeler. The name “heeler” describes the instinctive tendency of this breed to bite the heels of the animals they herd. This trait was created when Scotch Collies were mixed with Dingos in the late 1850’s. By 1900, the genetic behavior pattern was firmly established. Now, virtually every Heeler heels, instinctively. If you tell an Aussie drover that his dog had to be taught to heel. He’ll laugh at you, too, mate. Like his Pointer counterpart, the Heeler displays a trait that is transmitted genetically. It requires no training or encouragement.