okay so this is my suggestion, first off, it is incredibly dangerous to breed a small female with a larger male, particularly if your unsure of the size of both parents on both sides. It could result in the puppies becoming too large for her to safely carry, which could kill both momma and the babies. Even in cases where the male is smaller than the female it is not uncommon for there to be issues, which could end up costing the other women thousands of dollars in medical fees. also if the female is under 5lbs it is inadvisable for her to be bred. If you want to breed him , I don't suggest you jump into it. Do a lot of research, generally you would charge a stud fee, which varies greatly based off of his pedigree and who he has papers with. Or you would request pick of litter. I also am going to state this, just as a caution, if the female is not responsive to him, once they are locked together she could really injure him. Yet again i cannot urge you enough to do your research on this.