
According to the book of the bitch puppies are born in roughly equal numbers head first and feet first. Feet first is not a breech presentation, a breech is bottom first which will c ause difficulty.
Feet first in my experience just takes a little longer to deliver, especially if it is the first puppy as in my own last litter, and a litter I whelped for a friend last week, this is because the head is wider than the hind end, and head first opens things up more.
Peoblems often arise in small breeds I have been told, as the pups are relatively speaking large compared to the size of the dam.