If you want consistency, bloodlines and linebreeding are the only way to do it.
But now you might get a great dog from any breeding or the pound or in the parking lot of Mc Donalds.. Just don't expect to breed it and get a bunch of hog dogs..
Mine came from Walmart parking lot thats why i have been able to breed the pretty good and when I need to cull them, I take them back to walmart cause they take everything back.