Im afraid to say it, but I have had this conversation so many times with different  people about how we solve the "not enough homes/kennel space/ money" and all we could come up with was, either no one breeds any dog for 10 years, or all dogs that are unlikely to be rehomed in 3 months is PTS. It is horrible, I know of a rottie that I would love to have, but she cant live with small furries or children...she has been in care since 2005!