
I'm putting my reply at the bottom but it's not aimed at anyone in particular but rather several posters -a bit of catch all. :)
First off, personally I don't actually think home checks tells you all that much. Yes in this case there might have been the chance of seeing several other dogs, when there weren't meant to be any, but unless it was somebody with very large numbers and kennels they could temporarily be moved out of the way. Google streetview will tell a fair bit as well. But other than that, what will it tell you? That the house is clean or dirty? That the area is posh or poor? Really, does any of that make much difference? Surely what matters is how the dog will be cared for and treated, and an empty house cannot show that at all -only if it is a buyer that already has other dogs. Even then they can't tell you how they are treated, you can only see if they appear in good condition. And so many pet buyers won't have any other pets anyway. Oh and if I had home checked that buyer of mine that instantly sold the puppy on, the house couldn't have told me that either....
Secondly, I REALLY do understand the worry and the frustration, I really do, but speaking practically, I can understand why the KC, tradings standards and the RSPCA all will say there is nothing they can do. Because nothing has happened. There is no evidence of a badly treated dog for instance, you only have a buyer that lied. I don't think (but I would LOVE to be corrected here if I am wrong) there is anything in the law that says you have to tell the truth when buying something. In the eyes of the law a dog is just goods. If I went to a bookshop and picked up a Jackie Collins novel, told the cashier it was for my friend who reads that type of book, not for me myself who only ever read Jane Austen and Shakespeare, then went home and read the book and placed it alongside my collection of all other similar novels, then I'd have lied, but not done anything wrong in the eyes of the law. Unfortunately a book and a dog won't be treated any differently. :(
As for the ex, yes she could have had a reason to paint a bad picture of the buyer, but it seems you did find evidence of him not having told the truth anyway. How did the buyer get hold of you, could she not have gone down the same route? An advert, contact details left somewhere? Or if you're listed in the phonebook, if her ex mentioned a name, that would be all it took. So not necessarily all that strange I don't think.
All in all a very sad story but I really don't think much could have been done to prevent it from happening -if people decide to lie and are good at it, we can't do anything about it if we believe them. At home in Sweden , when I was a teenager, I used to have a friend who was a foster child. She lived in the same road. She loved dogs like I did. I noticed she lied every now and then but just learnt to live with it. A couple of years after I left Sweden to move to England, my friend was arrested and put in prison for fraud. She had managed to convince not one but several dog breeders to part with puppies, promising to pay them later, or to have them on breeding terms and give a puppy back, and then she sold them on. She also several times took money for dogs that didn't exist. She was let out of prison again but did the same thing again and again and I think was in prison again at least twice more. There was a LOT of publicity both in the dog press and in national papers and of course on the internet. Despite all of this, good breeders still fell for her stories because she was so good at lying. And again, had they done home checks, they wouldn't have found anything. The dogs were always very well cared for.