Factors that can influence litter size include:
* The age of the mother dog: Younger dogs tend to have smaller litters.
* The overall health of the mother dog: A healthy dog will usually have a larger litter.
* The breeding history of the mother dog: Dogs that have had large litters in the past are more likely to have large litters again.
It's important to consult a veterinarian to get the best estimate of the litter size for a particular Pekingese.