Nobody has to “train” an intact male dog to hump anything it can find. I’d like to know why a naked 2-yr-old boy and a pit bull were left alone together.
It’s obvious you don’t know anything about dogs. Most animals, cattle included, will mount to display domination. Animal behaviorists generally accept that the trait is non-sexual. Anyone who has a dog that “humps legs” is a witless fool, because it is easily trained out of them. I have trained guard dogs and sporting dogs of many breeds since I was 14 years old. I repeat, the rape of a child by a dog is aberrant behavior for a dog, any breed! This is the first time I have ever heard of it happening.