I've just been sent a FB page of a family very local to me who bought a pug puppy from a Gumtree and and she died of parvo three days later.
I am sorry for them, and to have had their new pup die in their arms must have been truly awful.
They are now working with the RSPCA, and police and have been on local radio trying to get attention for the case, having discovered that the same seller was selling multiple breeds from several set-up addresses.
But really, to buy an unvaccinated, un-microchipped puppy from a 'breeder' on Gumtree , and to collect the pup half an hour after you see the ad - how could anyone think that was a good idea? I just don't know how many times the message has to be repeated :(