Dog is a species. Ball python is a species. I was not talking about the physical drawbacks in picking two extremes. Snakes is not a species.
Most dog breeds started as mutts, that were healthy and had characteristics that someone valued, and bred into a "breed" that bred true, throwing only litters of pups that grew into adults resembling the parents.
The difference of todays reality is that people who MADE breeds, were interested in the health and use of the dog they were trying to create. If the person doing the breeding has the health and use of the dog in mind, then a mixed breed(i.e. labradoodle) can become it's own breed, with good health and distinct genetic characteristics. There are lines of labradoodles that are distinct.. but too many other "labradoodles" that are anything from poodle looking to lab looking to lsasa apso looking... so there is not established breed of labradoodle.
If you were breeding caramel ball pythons without regard to kinking or health.. then you'd be as bad as someone breeding puggles with lousy knees and allergies.. in my opinion.