When looking at Silky's, I had a few breeders tell me they would leave a tail for me if paid in full first.
What would concern me about that is having a breeder not dock a pup, then it gets to about 8-12 weeks old, and the pup is not a fit for my home. lol. That would kind of suck.
I am sure they would find a nice home, as most people I talk to prefer natural tails. So many that see Jackson and his long tail compliment him and say they wished they all were like that. I also watch a Rottweiler whom they had requested to keep the long tail from the breeder.