yes the first litter is always good . but this shoul be a litter produced always out of the 2nd heat .. ie the bitch should have skipped her first heat and should have her puppies only after the age 12 months. the litter is good because the body is prepared to have the litter , the female is in her prime and has not been over bred and tired . other than that you must check on the males side too . check for defects with the hind legs .