The quote doesn't insist all dogs are infinitely loyal.

Your disgusting prejudice aside, I've never met a pitbull in public that wasn't sweet and loving - which reinforces my suspicion that the real problem with them is the sort of psychotic, uncaring owner they attract.

When I was young, it was Dobermans that were demonized, and likewise the dog of choice for assholes who abused them as mere security devices.