[frontierrots]

as above some lines have large or small litters (typically looking at what her dam and sisters have whelped will give you a good idea)

However litter size also depends upon when bred. Bred too early or late will result in no or small litters as well

Then again some bitches seem to do their own thing My Molly had a litter of 5, 6 and then when I bred her I the last time i said to her "remember no more than 7" (I prefer 7 or less) and "this is the last time you will be doing this".. So for her third and final litter she gave me 10 ! LOL