I found the piece shocking, though it doesn't surprise me after thinking about it. Advertisers on the internet can claim anything and pictures of a healthy puppy doesn't mean that's what a buyer will get, expecially if the transaction takes place in a car park or the sickly pup is delivered to someones home.
Bet you are right buyers should ask to see certificates; but much more important, they should see the puppy in it's own home with it's mum.
I know even this can be stage managed and the dog they bring out might not be the mother, but these fraudsters are probably more than capable of producing fake papers and health certificates too!!!
What can be done? Especillay to end the suffering of the dogs.