Bud you cant get out of it.
There is absolutely no need to mate it to more than one bitch, if any at all.
If the first mating isnt successfull, the dog is still very young (far too young imo).
FTB
Blaming it on the dog already! ive seen a lot of bitches with problems that result in mismatings, takes 2 animals to breed!
What exactly is it you are wanting - two bitch pups, yes?
Put the dog to the best bitch you can find like any normal- non money orientated dogman would do(chances are you will get your two bitches from one litter).
If your looking to make money from a 20