I have two Mal pups I'm using on hogs now and they are doing GREAT!! Got them from Metropolitan K9.
metropolitank9.com/
Greg and Katrina continuously earn national titles with their dogs and if they don’t have a liter on the ground they can defiantly point you in the right direction.
Here is another good forum to see what is out there.
http://psak9forum.com/Personally I don’t recommend getting stock from Schutzhund lines. They have lowered the difficulty of their tests like hard hitting courage tests ect. While sports like PSA use tests like well just check out the video
http://www.youtube.com/watch?v=92NC4bj8DmE