Mardelin's comment
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Father size really has no bearing on the size of pups....It's all dependent on genetics.
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"No bearing" is a bit too broad of a statement. Some bearing would be more precise. It is really mostly a matter of statistics. Traits by either parent are more likely to be passed on to the descendant. In this case, using a smaller male is more likely to produce smaller pups then using a larger male. Size is determined by a suite of genes so as Mardelin implies, using a small male is not a guarantee that the pups will come out small. The best predictor for the stud will be in looking at what he has already sired.
jenhenwood
The size of the pups in utero during the last week will be the best indication if Delilah will have problem or not with a natural delivery. Did your vet give you an indication of their size? Without any other information I would agree with Littlebit an Yorkieaddict that Delilah stands a greater then normal chance of needing a cesarean due to her small size.
Good luck! I hope you get some extra puppies beyond the two that were seen by your vet.