Sorry to throw a wet blanket on such great concern and compassion...
The RSPCA will not do anything. As long as the dogs can stand up and turn around and have water, are not in hideous condition it is all good!!!
There is really squat any of us can do other than NEVER, EVER buy from a BYB, petshop, over the internet or trading post.
This is a classic BYB. They sell all over the place and they are the lowest of the very low.
"There is enough love and concern for animals in every community to overcome the irresposibility of the few"