I'm not sure I understand your question. What do you mean by "new breed"(bully)?
If you puppy is pedigree, then he/she should have a registration certificate from either The United Kennel Club (UKC) or The American Dog Breeders Association (ADBA). There are other registries out there. However, I do not consider them to be credible.
You can't win if you don't play the game -- Me!
All cruelty stems from weakness -- Seneca
Sometimes a dog is as good as any man -- Bell/Houser
If you didn't see both parents to your pup or if he's not Kennel Club registered then you can never know for sure. I don't even think a DNA test could help you. If he looks mixed then he probably is. Do some research on the breed and their characteristics and see if they are similar to your male. It's a little easier to tell when their older.