I just got a dogo pup from la cocha kennels in cordoba Argentina and it cost me $1800 . He's from some of the best stock you can get.
I guarantee spending that much money on a puppy is sure going to make you over see any short comings the dog has, and I'm sure you would never cull the dog for any reason if he needed it.
I can promise you where my pup came from the guy would be highly upset if I didn't cull if he didn't work and you can subtract at least 85% of the cost of the $1800 pup.