I have a litter of working golden retrievers, i collated a waiting list before I had our bitch mated and I spent a long time speaking to interested parties to find the best homes I could do - this is how I have dealt with previous litters.
Both parents are working gundogs and I stated that whilst I didn't need working homes I would only consider active homes with the space to accommodate a large working breed.
One of the families who is on my list contacted me today just to say "hi, my husband and I have decided to split up, I will still be wanting the puppy but my address will now by Flat4a XYZ Town"
I messaged back to enquire what sort of set up it was and she confirmed it's a flat on the top floor with no garden or outside space. I've confirmed with her that I'm not happy to sell a puppy to a home without any outside space and I will refund her deposit immediately and advertise the puppy. She's refusing to give me her bank details and says she wants the pup and will take legal action if required. My argument is that the home I vetted is no longer the home she's offering and therefore I'm not willing to sell her the puppy. To me, changing the home on offer isn't dissimilar to her changing the amount of money she is willing to pay for the pup. The homes I find for puppies are very important to me, I'm not a big breeder, I've just had a litter for my own purposes to keep the next generation and I need to know my puppies are going to the right sort of home.