It is very sad and, unfortunately, happening all over the world
IMO There should be more rules and regulations in place to make dog breeding (infact any animal breeding) more difficult. The bloody KC, and their equivelants worldwide, should insist that relevant health screening should be performed on the parents of any puppys that they register.
Local councils should also prohibit (or at least monitor) dog breeding in their rental properties and social security should prosecute anyone on benefits making money from breeding and not declaring it as an income.
All puppys, whether pedigree or mongrel, should be traceable back to the breeder - tattooed (which is traceable back to the breeder) or microchipped (which isn't, but should be made traceable) before sale and they must be prepared to take the dog back during anytime in its life.
That's just a start as I need to step off my soap-box and make a cup of tea