Uhm..Pits aren't hybrids. It's a breed of dog. Hybrids are animals that wouldn't normally breed, lions and tigers, for example. In many cases, the two animals have a different number of chromosomes which is why the offspring is usually sterile.
ummm they are considered hybrids here. I wonder what you consider a wolf. ahahaha what do you consider a ferret. hybrid consists of crosses between populations, breeds or cultivars within a single species.