The human analogy is bogus. We are one race (homo sapiens sapiens). Different ethnicities, but one race.
Considering our vast physical and cultural differences, I beg to differ. We're one species, but different races (breeds, with the dog analogy). There's nothing wrong with it, it's just fact.
Dogs are bred for qualities, and different breeds serve different functions. Working dogs (collies for example) are used for herding animals. Gun dogs (historically) for flushing and retrieving game. Nowadays, there are those who breed the most overt traits to create more niche breeds. I read the Bully XL is just a larger version of another established breed.
The issue is, these dogs were bred as fighting dogs. Short ears (less easy to bite into), powerful jaws, wide mouths. Bred to fight.
Few people (if any at all) are born 'bad'. And even being a sociopath doesn't make you a killer. Successful CEO's, bankers etc, tend to score high on sociopathy scores.
But dogs? You can create breeds that are primed to be dangerous. Even a well natured XL, if pushed, can bite. But when it bites, it's been bred to shred.
That's the history of it, but it doesn't mean that traditionally fighting breeds have to fight. They're born with strong muscles, strong jaws and a high energy level that has to be channelled. If it isn't, it'll result in a heightened level of anxiety and aggression. Similarly to sociopaths making good CEOs, strong breeds can make good hunting or sporting dogs. They don't have to be outlawed just because we, humans are stupid enough not choose a breed that matches our lifestyle when buying a dog. If you live in a flat, or if you don't have the time and energy to give your dog proper and regular exercise and discipline, you shouldn't buy a strong breed. It's that simple.
Even some humans were "bred" to be kings, nobles, or slaves throughout history. It doesn't mean we're still kings and slaves up to this day.
Not to mention I'm very curious what the law says about mixed breeds, or how exactly these breeds are going to be outlawed - are existing specimens gonna get killed? Or is it only breeding that's not allowed? Or the buying of such breeds? What exactly is outlawed? How is it gonna be controlled? My American bulldog fornicates with your American bulldog without our knowledge, so what's with the puppies now?
All in all, I think racism is racism, whether it's directed at humans, or dogs. We are all different, dogs are all different, we should accept it and learn to live with it.